{
  "name": "Lindcott Armory U.S. Ammunition Price Index (1900–2026)",
  "description": "Nominal retail price per round, bulk practice/FMJ tier where available, for 18 U.S. calibers. Values between curated anchor years are piecewise-linear interpolated. Confidence tier varies by era.",
  "unit": "USD per round (nominal)",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Lindcott Armory — lindcottarmory.com/field-guide/ammo-prices",
  "temporalCoverage": "1900/2026",
  "sources": [
    "Shooter's Bible & manufacturer catalogs",
    "BLS PPI series PCU332992332992",
    "AmmoSeek / WikiArms / retailer data (2009–2026)"
  ],
  "confidenceTiers": {
    "historical_catalog": "±8% (1900–1969)",
    "trade_ppi_indexed": "±12.5% (1970–2008)",
    "tracked_retail": "±4% (2009–2026)"
  },
  "generated": null,
  "calibers": [
    {
      "key": "9mm",
      "label": "9mm",
      "group": "pistol",
      "basis": "bulk practice / FMJ",
      "firstYear": 1915,
      "series": [
        {
          "year": 1915,
          "usd_per_round": 0.06,
          "tier": "historical_catalog"
        },
        {
          "year": 1916,
          "usd_per_round": 0.0603,
          "tier": "historical_catalog"
        },
        {
          "year": 1917,
          "usd_per_round": 0.0607,
          "tier": "historical_catalog"
        },
        {
          "year": 1918,
          "usd_per_round": 0.061,
          "tier": "historical_catalog"
        },
        {
          "year": 1919,
          "usd_per_round": 0.0613,
          "tier": "historical_catalog"
        },
        {
          "year": 1920,
          "usd_per_round": 0.0617,
          "tier": "historical_catalog"
        },
        {
          "year": 1921,
          "usd_per_round": 0.062,
          "tier": "historical_catalog"
        },
        {
          "year": 1922,
          "usd_per_round": 0.0623,
          "tier": "historical_catalog"
        },
        {
          "year": 1923,
          "usd_per_round": 0.0627,
          "tier": "historical_catalog"
        },
        {
          "year": 1924,
          "usd_per_round": 0.063,
          "tier": "historical_catalog"
        },
        {
          "year": 1925,
          "usd_per_round": 0.0633,
          "tier": "historical_catalog"
        },
        {
          "year": 1926,
          "usd_per_round": 0.0637,
          "tier": "historical_catalog"
        },
        {
          "year": 1927,
          "usd_per_round": 0.064,
          "tier": "historical_catalog"
        },
        {
          "year": 1928,
          "usd_per_round": 0.0643,
          "tier": "historical_catalog"
        },
        {
          "year": 1929,
          "usd_per_round": 0.0647,
          "tier": "historical_catalog"
        },
        {
          "year": 1930,
          "usd_per_round": 0.065,
          "tier": "historical_catalog"
        },
        {
          "year": 1931,
          "usd_per_round": 0.0659,
          "tier": "historical_catalog"
        },
        {
          "year": 1932,
          "usd_per_round": 0.0667,
          "tier": "historical_catalog"
        },
        {
          "year": 1933,
          "usd_per_round": 0.0675,
          "tier": "historical_catalog"
        },
        {
          "year": 1934,
          "usd_per_round": 0.0684,
          "tier": "historical_catalog"
        },
        {
          "year": 1935,
          "usd_per_round": 0.0693,
          "tier": "historical_catalog"
        },
        {
          "year": 1936,
          "usd_per_round": 0.0701,
          "tier": "historical_catalog"
        },
        {
          "year": 1937,
          "usd_per_round": 0.0709,
          "tier": "historical_catalog"
        },
        {
          "year": 1938,
          "usd_per_round": 0.0718,
          "tier": "historical_catalog"
        },
        {
          "year": 1939,
          "usd_per_round": 0.0727,
          "tier": "historical_catalog"
        },
        {
          "year": 1940,
          "usd_per_round": 0.0735,
          "tier": "historical_catalog"
        },
        {
          "year": 1941,
          "usd_per_round": 0.0743,
          "tier": "historical_catalog"
        },
        {
          "year": 1942,
          "usd_per_round": 0.0752,
          "tier": "historical_catalog"
        },
        {
          "year": 1943,
          "usd_per_round": 0.0761,
          "tier": "historical_catalog"
        },
        {
          "year": 1944,
          "usd_per_round": 0.0769,
          "tier": "historical_catalog"
        },
        {
          "year": 1945,
          "usd_per_round": 0.0777,
          "tier": "historical_catalog"
        },
        {
          "year": 1946,
          "usd_per_round": 0.0786,
          "tier": "historical_catalog"
        },
        {
          "year": 1947,
          "usd_per_round": 0.0795,
          "tier": "historical_catalog"
        },
        {
          "year": 1948,
          "usd_per_round": 0.0803,
          "tier": "historical_catalog"
        },
        {
          "year": 1949,
          "usd_per_round": 0.0811,
          "tier": "historical_catalog"
        },
        {
          "year": 1950,
          "usd_per_round": 0.082,
          "tier": "historical_catalog"
        },
        {
          "year": 1951,
          "usd_per_round": 0.0828,
          "tier": "historical_catalog"
        },
        {
          "year": 1952,
          "usd_per_round": 0.0836,
          "tier": "historical_catalog"
        },
        {
          "year": 1953,
          "usd_per_round": 0.0844,
          "tier": "historical_catalog"
        },
        {
          "year": 1954,
          "usd_per_round": 0.0852,
          "tier": "historical_catalog"
        },
        {
          "year": 1955,
          "usd_per_round": 0.086,
          "tier": "historical_catalog"
        },
        {
          "year": 1956,
          "usd_per_round": 0.0868,
          "tier": "historical_catalog"
        },
        {
          "year": 1957,
          "usd_per_round": 0.0876,
          "tier": "historical_catalog"
        },
        {
          "year": 1958,
          "usd_per_round": 0.0884,
          "tier": "historical_catalog"
        },
        {
          "year": 1959,
          "usd_per_round": 0.0892,
          "tier": "historical_catalog"
        },
        {
          "year": 1960,
          "usd_per_round": 0.09,
          "tier": "historical_catalog"
        },
        {
          "year": 1961,
          "usd_per_round": 0.0905,
          "tier": "historical_catalog"
        },
        {
          "year": 1962,
          "usd_per_round": 0.091,
          "tier": "historical_catalog"
        },
        {
          "year": 1963,
          "usd_per_round": 0.0915,
          "tier": "historical_catalog"
        },
        {
          "year": 1964,
          "usd_per_round": 0.092,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.0925,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.093,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.0935,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.094,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.0945,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.095,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.1045,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.114,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.1235,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.133,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.1425,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.152,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.1615,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.171,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.1805,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.19,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.1895,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.189,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.1885,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.188,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.1875,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.187,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.1865,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.186,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.1855,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.185,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.1765,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.168,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.1595,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.151,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.1425,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.134,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.1255,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.117,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.1085,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.1,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.102,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.104,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.106,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.108,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.11,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.1233,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.1367,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.15,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.16,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.17,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.18,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.19,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.35,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.3033,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.2567,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.21,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.1967,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.1833,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.17,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.18,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 0.35,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 0.46,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 0.31,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 0.265,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.255,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.265,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "45acp",
      "label": ".45 ACP",
      "group": "pistol",
      "basis": "bulk practice / FMJ",
      "firstYear": 1905,
      "series": [
        {
          "year": 1905,
          "usd_per_round": 0.075,
          "tier": "historical_catalog"
        },
        {
          "year": 1906,
          "usd_per_round": 0.0753,
          "tier": "historical_catalog"
        },
        {
          "year": 1907,
          "usd_per_round": 0.0757,
          "tier": "historical_catalog"
        },
        {
          "year": 1908,
          "usd_per_round": 0.076,
          "tier": "historical_catalog"
        },
        {
          "year": 1909,
          "usd_per_round": 0.0763,
          "tier": "historical_catalog"
        },
        {
          "year": 1910,
          "usd_per_round": 0.0767,
          "tier": "historical_catalog"
        },
        {
          "year": 1911,
          "usd_per_round": 0.077,
          "tier": "historical_catalog"
        },
        {
          "year": 1912,
          "usd_per_round": 0.0773,
          "tier": "historical_catalog"
        },
        {
          "year": 1913,
          "usd_per_round": 0.0777,
          "tier": "historical_catalog"
        },
        {
          "year": 1914,
          "usd_per_round": 0.078,
          "tier": "historical_catalog"
        },
        {
          "year": 1915,
          "usd_per_round": 0.0783,
          "tier": "historical_catalog"
        },
        {
          "year": 1916,
          "usd_per_round": 0.0787,
          "tier": "historical_catalog"
        },
        {
          "year": 1917,
          "usd_per_round": 0.079,
          "tier": "historical_catalog"
        },
        {
          "year": 1918,
          "usd_per_round": 0.0793,
          "tier": "historical_catalog"
        },
        {
          "year": 1919,
          "usd_per_round": 0.0797,
          "tier": "historical_catalog"
        },
        {
          "year": 1920,
          "usd_per_round": 0.08,
          "tier": "historical_catalog"
        },
        {
          "year": 1921,
          "usd_per_round": 0.0804,
          "tier": "historical_catalog"
        },
        {
          "year": 1922,
          "usd_per_round": 0.0808,
          "tier": "historical_catalog"
        },
        {
          "year": 1923,
          "usd_per_round": 0.0812,
          "tier": "historical_catalog"
        },
        {
          "year": 1924,
          "usd_per_round": 0.0816,
          "tier": "historical_catalog"
        },
        {
          "year": 1925,
          "usd_per_round": 0.082,
          "tier": "historical_catalog"
        },
        {
          "year": 1926,
          "usd_per_round": 0.0824,
          "tier": "historical_catalog"
        },
        {
          "year": 1927,
          "usd_per_round": 0.0828,
          "tier": "historical_catalog"
        },
        {
          "year": 1928,
          "usd_per_round": 0.0832,
          "tier": "historical_catalog"
        },
        {
          "year": 1929,
          "usd_per_round": 0.0836,
          "tier": "historical_catalog"
        },
        {
          "year": 1930,
          "usd_per_round": 0.084,
          "tier": "historical_catalog"
        },
        {
          "year": 1931,
          "usd_per_round": 0.0844,
          "tier": "historical_catalog"
        },
        {
          "year": 1932,
          "usd_per_round": 0.0848,
          "tier": "historical_catalog"
        },
        {
          "year": 1933,
          "usd_per_round": 0.0852,
          "tier": "historical_catalog"
        },
        {
          "year": 1934,
          "usd_per_round": 0.0856,
          "tier": "historical_catalog"
        },
        {
          "year": 1935,
          "usd_per_round": 0.086,
          "tier": "historical_catalog"
        },
        {
          "year": 1936,
          "usd_per_round": 0.0864,
          "tier": "historical_catalog"
        },
        {
          "year": 1937,
          "usd_per_round": 0.0868,
          "tier": "historical_catalog"
        },
        {
          "year": 1938,
          "usd_per_round": 0.0872,
          "tier": "historical_catalog"
        },
        {
          "year": 1939,
          "usd_per_round": 0.0876,
          "tier": "historical_catalog"
        },
        {
          "year": 1940,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1941,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1942,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1943,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1944,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1945,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1946,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1947,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1948,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1949,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1950,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1951,
          "usd_per_round": 0.0902,
          "tier": "historical_catalog"
        },
        {
          "year": 1952,
          "usd_per_round": 0.0924,
          "tier": "historical_catalog"
        },
        {
          "year": 1953,
          "usd_per_round": 0.0946,
          "tier": "historical_catalog"
        },
        {
          "year": 1954,
          "usd_per_round": 0.0968,
          "tier": "historical_catalog"
        },
        {
          "year": 1955,
          "usd_per_round": 0.099,
          "tier": "historical_catalog"
        },
        {
          "year": 1956,
          "usd_per_round": 0.1012,
          "tier": "historical_catalog"
        },
        {
          "year": 1957,
          "usd_per_round": 0.1034,
          "tier": "historical_catalog"
        },
        {
          "year": 1958,
          "usd_per_round": 0.1056,
          "tier": "historical_catalog"
        },
        {
          "year": 1959,
          "usd_per_round": 0.1078,
          "tier": "historical_catalog"
        },
        {
          "year": 1960,
          "usd_per_round": 0.11,
          "tier": "historical_catalog"
        },
        {
          "year": 1961,
          "usd_per_round": 0.1165,
          "tier": "historical_catalog"
        },
        {
          "year": 1962,
          "usd_per_round": 0.123,
          "tier": "historical_catalog"
        },
        {
          "year": 1963,
          "usd_per_round": 0.1295,
          "tier": "historical_catalog"
        },
        {
          "year": 1964,
          "usd_per_round": 0.136,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.1425,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.149,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.1555,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.162,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.1685,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.175,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.1955,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.2365,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.257,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.2775,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.298,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.3185,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.339,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.3595,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.38,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.376,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.372,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.368,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.364,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.36,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.356,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.352,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.348,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.344,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.34,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.322,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.304,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.286,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.268,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.25,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.232,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.214,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.196,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.178,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.16,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.166,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.172,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.178,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.184,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.19,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.21,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.22,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.225,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.23,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.235,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.24,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.45,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.3933,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.3367,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.28,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.2767,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.2733,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.27,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.29,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 0.49,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 0.6,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 0.41,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 0.35,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.34,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.36,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "40sw",
      "label": ".40 S&W",
      "group": "pistol",
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      "firstYear": 1990,
      "series": [
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          "year": 1990,
          "usd_per_round": 0.28,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.274,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.268,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.262,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.256,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.25,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.24,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.23,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.22,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.21,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.202,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.204,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.206,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.208,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.21,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.2233,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.2367,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.25,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.26,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.27,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
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          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.29,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.4267,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
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          "tier": "tracked_retail"
        },
        {
          "year": 2016,
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          "tier": "tracked_retail"
        },
        {
          "year": 2017,
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          "tier": "tracked_retail"
        },
        {
          "year": 2018,
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          "tier": "tracked_retail"
        },
        {
          "year": 2019,
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          "tier": "tracked_retail"
        },
        {
          "year": 2020,
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          "tier": "tracked_retail"
        },
        {
          "year": 2021,
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          "tier": "tracked_retail"
        },
        {
          "year": 2022,
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          "tier": "tracked_retail"
        },
        {
          "year": 2023,
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          "tier": "tracked_retail"
        },
        {
          "year": 2024,
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          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.32,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.33,
          "tier": "tracked_retail"
        }
      ]
    },
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      "key": "380acp",
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          "tier": "historical_catalog"
        },
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          "year": 1916,
          "usd_per_round": 0.0553,
          "tier": "historical_catalog"
        },
        {
          "year": 1917,
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          "tier": "historical_catalog"
        },
        {
          "year": 1918,
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          "tier": "historical_catalog"
        },
        {
          "year": 1919,
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          "tier": "historical_catalog"
        },
        {
          "year": 1920,
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          "tier": "historical_catalog"
        },
        {
          "year": 1921,
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          "tier": "historical_catalog"
        },
        {
          "year": 1922,
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          "tier": "historical_catalog"
        },
        {
          "year": 1923,
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          "tier": "historical_catalog"
        },
        {
          "year": 1924,
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          "tier": "historical_catalog"
        },
        {
          "year": 1925,
          "usd_per_round": 0.0583,
          "tier": "historical_catalog"
        },
        {
          "year": 1926,
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          "tier": "historical_catalog"
        },
        {
          "year": 1927,
          "usd_per_round": 0.059,
          "tier": "historical_catalog"
        },
        {
          "year": 1928,
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          "tier": "historical_catalog"
        },
        {
          "year": 1929,
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          "tier": "historical_catalog"
        },
        {
          "year": 1930,
          "usd_per_round": 0.06,
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        },
        {
          "year": 1931,
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          "tier": "historical_catalog"
        },
        {
          "year": 1932,
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          "tier": "historical_catalog"
        },
        {
          "year": 1933,
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          "tier": "historical_catalog"
        },
        {
          "year": 1934,
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          "tier": "historical_catalog"
        },
        {
          "year": 1935,
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          "tier": "historical_catalog"
        },
        {
          "year": 1936,
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          "tier": "historical_catalog"
        },
        {
          "year": 1937,
          "usd_per_round": 0.0617,
          "tier": "historical_catalog"
        },
        {
          "year": 1938,
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          "tier": "historical_catalog"
        },
        {
          "year": 1939,
          "usd_per_round": 0.0622,
          "tier": "historical_catalog"
        },
        {
          "year": 1940,
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          "tier": "historical_catalog"
        },
        {
          "year": 1941,
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          "tier": "historical_catalog"
        },
        {
          "year": 1942,
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          "tier": "historical_catalog"
        },
        {
          "year": 1943,
          "usd_per_round": 0.0633,
          "tier": "historical_catalog"
        },
        {
          "year": 1944,
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          "tier": "historical_catalog"
        },
        {
          "year": 1945,
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          "tier": "historical_catalog"
        },
        {
          "year": 1946,
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          "tier": "historical_catalog"
        },
        {
          "year": 1947,
          "usd_per_round": 0.0643,
          "tier": "historical_catalog"
        },
        {
          "year": 1948,
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          "tier": "historical_catalog"
        },
        {
          "year": 1949,
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          "tier": "historical_catalog"
        },
        {
          "year": 1950,
          "usd_per_round": 0.065,
          "tier": "historical_catalog"
        },
        {
          "year": 1951,
          "usd_per_round": 0.066,
          "tier": "historical_catalog"
        },
        {
          "year": 1952,
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          "tier": "historical_catalog"
        },
        {
          "year": 1953,
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          "tier": "historical_catalog"
        },
        {
          "year": 1954,
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          "tier": "historical_catalog"
        },
        {
          "year": 1955,
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          "tier": "historical_catalog"
        },
        {
          "year": 1956,
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          "tier": "historical_catalog"
        },
        {
          "year": 1957,
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          "tier": "historical_catalog"
        },
        {
          "year": 1958,
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          "tier": "historical_catalog"
        },
        {
          "year": 1959,
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          "tier": "historical_catalog"
        },
        {
          "year": 1960,
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          "tier": "historical_catalog"
        },
        {
          "year": 1961,
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          "tier": "historical_catalog"
        },
        {
          "year": 1962,
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          "tier": "historical_catalog"
        },
        {
          "year": 1963,
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          "tier": "historical_catalog"
        },
        {
          "year": 1964,
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          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.08,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
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          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.082,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.083,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.084,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.085,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.0925,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.1,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.1075,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.115,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.1225,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.13,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.1375,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.145,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.1525,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.16,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.161,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.162,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.163,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.164,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.165,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.166,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.167,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.168,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.169,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.17,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.169,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.168,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.167,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.166,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.165,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.164,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.163,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.162,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.161,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.16,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.164,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.168,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.172,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.176,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.18,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.2033,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.2267,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.25,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.2575,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.265,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
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          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.28,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.55,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
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          "tier": "tracked_retail"
        },
        {
          "year": 2015,
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          "tier": "tracked_retail"
        },
        {
          "year": 2016,
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          "tier": "tracked_retail"
        },
        {
          "year": 2017,
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          "tier": "tracked_retail"
        },
        {
          "year": 2018,
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          "tier": "tracked_retail"
        },
        {
          "year": 2019,
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        },
        {
          "year": 2020,
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          "tier": "tracked_retail"
        },
        {
          "year": 2021,
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        },
        {
          "year": 2022,
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        },
        {
          "year": 2023,
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        },
        {
          "year": 2024,
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          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.34,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.355,
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        }
      ]
    },
    {
      "key": "357mag",
      "label": ".357 Mag",
      "group": "pistol",
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      "firstYear": 1935,
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          "year": 1935,
          "usd_per_round": 0.2,
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        },
        {
          "year": 1936,
          "usd_per_round": 0.2013,
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        },
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        },
        {
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        },
        {
          "year": 1939,
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        },
        {
          "year": 1940,
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          "tier": "historical_catalog"
        },
        {
          "year": 1941,
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        },
        {
          "year": 1942,
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          "tier": "historical_catalog"
        },
        {
          "year": 1943,
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        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1945,
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        },
        {
          "year": 1946,
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          "tier": "historical_catalog"
        },
        {
          "year": 1947,
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        },
        {
          "year": 1948,
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          "tier": "historical_catalog"
        },
        {
          "year": 1949,
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          "tier": "historical_catalog"
        },
        {
          "year": 1950,
          "usd_per_round": 0.22,
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        },
        {
          "year": 1951,
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        },
        {
          "year": 1952,
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        },
        {
          "year": 1953,
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        },
        {
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        },
        {
          "year": 1955,
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        },
        {
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1958,
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          "tier": "historical_catalog"
        },
        {
          "year": 1959,
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        },
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        },
        {
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        },
        {
          "year": 1962,
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        },
        {
          "year": 1963,
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        },
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        },
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          "year": 1965,
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        },
        {
          "year": 1966,
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        },
        {
          "year": 1967,
          "usd_per_round": 0.265,
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        },
        {
          "year": 1968,
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        },
        {
          "year": 1969,
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        },
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          "year": 1970,
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          "year": 1971,
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          "tier": "trade_ppi_indexed"
        },
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        },
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          "year": 1973,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.37,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
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          "tier": "trade_ppi_indexed"
        },
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          "year": 1977,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
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          "tier": "trade_ppi_indexed"
        },
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          "year": 1980,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.458,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.456,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.454,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.453,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.452,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.451,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.45,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.443,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.436,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.429,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.422,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.415,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.408,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.401,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.394,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.387,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.38,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.384,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.392,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.396,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.4,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.4267,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.4533,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.48,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.4975,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.515,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.5325,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.55,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.85,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.76,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.67,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.58,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.5633,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.5467,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.53,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.56,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 0.82,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 1.05,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 0.72,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 0.64,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.61,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.63,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "44mag",
      "label": ".44 Mag",
      "group": "pistol",
      "basis": "bulk practice / FMJ",
      "firstYear": 1956,
      "series": [
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          "year": 1956,
          "usd_per_round": 0.4,
          "tier": "historical_catalog"
        },
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          "year": 1957,
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          "tier": "historical_catalog"
        },
        {
          "year": 1958,
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          "tier": "historical_catalog"
        },
        {
          "year": 1959,
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          "tier": "historical_catalog"
        },
        {
          "year": 1960,
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          "tier": "historical_catalog"
        },
        {
          "year": 1961,
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          "tier": "historical_catalog"
        },
        {
          "year": 1962,
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          "tier": "historical_catalog"
        },
        {
          "year": 1963,
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          "tier": "historical_catalog"
        },
        {
          "year": 1964,
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          "tier": "historical_catalog"
        },
        {
          "year": 1965,
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          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.468,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
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          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.484,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.492,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.5,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.515,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.53,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.545,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.56,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.59,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.605,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.62,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.635,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.65,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.647,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.644,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.641,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.638,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.635,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.632,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.629,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.626,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.623,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.62,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.614,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.608,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.602,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.596,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.59,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.584,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.578,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.572,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.566,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.56,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.564,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.568,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.572,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.576,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.58,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.62,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.66,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.7,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.72,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.74,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.76,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
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        },
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          "year": 2013,
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          "tier": "tracked_retail"
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          "year": 2014,
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          "tier": "tracked_retail"
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        {
          "year": 2015,
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        },
        {
          "year": 2016,
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          "tier": "tracked_retail"
        },
        {
          "year": 2017,
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          "tier": "tracked_retail"
        },
        {
          "year": 2018,
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        },
        {
          "year": 2019,
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        {
          "year": 2020,
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          "tier": "tracked_retail"
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        {
          "year": 2021,
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          "tier": "tracked_retail"
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        {
          "year": 2022,
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        {
          "year": 2023,
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          "tier": "tracked_retail"
        },
        {
          "year": 2024,
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          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.89,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
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          "tier": "tracked_retail"
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      ]
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      "key": "556",
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          "year": 1963,
          "usd_per_round": 0.185,
          "tier": "historical_catalog"
        },
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          "year": 1964,
          "usd_per_round": 0.1907,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.1964,
          "tier": "historical_catalog"
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        {
          "year": 1966,
          "usd_per_round": 0.2021,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.2079,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
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          "tier": "historical_catalog"
        },
        {
          "year": 1969,
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          "tier": "historical_catalog"
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        {
          "year": 1970,
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          "year": 1971,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
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          "tier": "trade_ppi_indexed"
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        {
          "year": 1974,
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          "tier": "trade_ppi_indexed"
        },
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          "year": 1975,
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          "tier": "trade_ppi_indexed"
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        {
          "year": 1976,
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        },
        {
          "year": 1977,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.301,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
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          "tier": "trade_ppi_indexed"
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        {
          "year": 1980,
          "usd_per_round": 0.32,
          "tier": "trade_ppi_indexed"
        },
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          "year": 1981,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.304,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.256,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.248,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.255,
          "tier": "trade_ppi_indexed"
        },
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          "year": 1992,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.285,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.3,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.2675,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.235,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.2162,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.1975,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.1787,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.16,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.158,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.156,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
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        },
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          "year": 2009,
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        },
        {
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        },
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          "year": 2013,
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        },
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        },
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          "year": 2015,
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        },
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        },
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          "year": 2018,
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        },
        {
          "year": 2019,
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        {
          "year": 2020,
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        {
          "year": 2021,
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        {
          "year": 2022,
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        },
        {
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        },
        {
          "year": 2024,
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        },
        {
          "year": 2025,
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        },
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          "year": 2026,
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        }
      ]
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    {
      "key": "308",
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        },
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
        },
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          "year": 1987,
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "year": 1989,
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          "tier": "trade_ppi_indexed"
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          "year": 1990,
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
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          "year": 1993,
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
        },
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          "year": 1995,
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          "tier": "trade_ppi_indexed"
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
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          "tier": "trade_ppi_indexed"
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          "year": 1999,
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
        },
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          "year": 2001,
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          "tier": "trade_ppi_indexed"
        },
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          "year": 2002,
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          "tier": "trade_ppi_indexed"
        },
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          "year": 2003,
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
        },
        {
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          "tier": "trade_ppi_indexed"
        },
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          "tier": "trade_ppi_indexed"
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          "year": 2008,
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        },
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          "year": 2009,
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          "tier": "tracked_retail"
        },
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          "tier": "tracked_retail"
        },
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          "tier": "tracked_retail"
        },
        {
          "year": 2014,
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          "tier": "tracked_retail"
        },
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          "year": 2015,
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        },
        {
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        },
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          "year": 2017,
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        },
        {
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          "tier": "tracked_retail"
        },
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          "year": 2019,
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        {
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          "year": 2022,
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          "year": 2023,
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        },
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          "year": 2024,
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          "tier": "tracked_retail"
        },
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          "year": 2025,
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          "tier": "tracked_retail"
        },
        {
          "year": 2026,
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          "tier": "tracked_retail"
        }
      ]
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      "key": "3006",
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        },
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          "tier": "historical_catalog"
        },
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        },
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          "tier": "historical_catalog"
        },
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          "tier": "historical_catalog"
        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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          "tier": "historical_catalog"
        },
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          "tier": "historical_catalog"
        },
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        },
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        },
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        },
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          "tier": "historical_catalog"
        },
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          "year": 1927,
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          "tier": "historical_catalog"
        },
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        },
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          "year": 1929,
          "usd_per_round": 0.0798,
          "tier": "historical_catalog"
        },
        {
          "year": 1930,
          "usd_per_round": 0.0825,
          "tier": "historical_catalog"
        },
        {
          "year": 1931,
          "usd_per_round": 0.0853,
          "tier": "historical_catalog"
        },
        {
          "year": 1932,
          "usd_per_round": 0.088,
          "tier": "historical_catalog"
        },
        {
          "year": 1933,
          "usd_per_round": 0.0907,
          "tier": "historical_catalog"
        },
        {
          "year": 1934,
          "usd_per_round": 0.0935,
          "tier": "historical_catalog"
        },
        {
          "year": 1935,
          "usd_per_round": 0.0963,
          "tier": "historical_catalog"
        },
        {
          "year": 1936,
          "usd_per_round": 0.099,
          "tier": "historical_catalog"
        },
        {
          "year": 1937,
          "usd_per_round": 0.1018,
          "tier": "historical_catalog"
        },
        {
          "year": 1938,
          "usd_per_round": 0.1045,
          "tier": "historical_catalog"
        },
        {
          "year": 1939,
          "usd_per_round": 0.1072,
          "tier": "historical_catalog"
        },
        {
          "year": 1940,
          "usd_per_round": 0.11,
          "tier": "historical_catalog"
        },
        {
          "year": 1941,
          "usd_per_round": 0.1151,
          "tier": "historical_catalog"
        },
        {
          "year": 1942,
          "usd_per_round": 0.1202,
          "tier": "historical_catalog"
        },
        {
          "year": 1943,
          "usd_per_round": 0.1253,
          "tier": "historical_catalog"
        },
        {
          "year": 1944,
          "usd_per_round": 0.1304,
          "tier": "historical_catalog"
        },
        {
          "year": 1945,
          "usd_per_round": 0.1355,
          "tier": "historical_catalog"
        },
        {
          "year": 1946,
          "usd_per_round": 0.1406,
          "tier": "historical_catalog"
        },
        {
          "year": 1947,
          "usd_per_round": 0.1457,
          "tier": "historical_catalog"
        },
        {
          "year": 1948,
          "usd_per_round": 0.1508,
          "tier": "historical_catalog"
        },
        {
          "year": 1949,
          "usd_per_round": 0.1559,
          "tier": "historical_catalog"
        },
        {
          "year": 1950,
          "usd_per_round": 0.161,
          "tier": "historical_catalog"
        },
        {
          "year": 1951,
          "usd_per_round": 0.1674,
          "tier": "historical_catalog"
        },
        {
          "year": 1952,
          "usd_per_round": 0.1738,
          "tier": "historical_catalog"
        },
        {
          "year": 1953,
          "usd_per_round": 0.1802,
          "tier": "historical_catalog"
        },
        {
          "year": 1954,
          "usd_per_round": 0.1866,
          "tier": "historical_catalog"
        },
        {
          "year": 1955,
          "usd_per_round": 0.193,
          "tier": "historical_catalog"
        },
        {
          "year": 1956,
          "usd_per_round": 0.1994,
          "tier": "historical_catalog"
        },
        {
          "year": 1957,
          "usd_per_round": 0.2058,
          "tier": "historical_catalog"
        },
        {
          "year": 1958,
          "usd_per_round": 0.2122,
          "tier": "historical_catalog"
        },
        {
          "year": 1959,
          "usd_per_round": 0.2186,
          "tier": "historical_catalog"
        },
        {
          "year": 1960,
          "usd_per_round": 0.225,
          "tier": "historical_catalog"
        },
        {
          "year": 1961,
          "usd_per_round": 0.237,
          "tier": "historical_catalog"
        },
        {
          "year": 1962,
          "usd_per_round": 0.249,
          "tier": "historical_catalog"
        },
        {
          "year": 1963,
          "usd_per_round": 0.261,
          "tier": "historical_catalog"
        },
        {
          "year": 1964,
          "usd_per_round": 0.273,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.285,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.297,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.309,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.321,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.333,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.345,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.3685,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.392,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.4155,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.439,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.4625,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.486,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.5095,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.533,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.5565,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.58,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.569,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.558,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.547,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.536,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.525,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.514,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.503,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.492,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.481,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.47,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.459,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.448,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.437,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.426,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.415,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.404,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.393,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.382,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.371,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.36,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.372,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.384,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.396,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.408,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.42,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.46,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.5,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.54,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.56,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.58,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.6,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.62,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 1.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 1.0333,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.8667,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.7,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.68,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.66,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.64,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.66,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 1,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 1.3,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 0.9,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 0.76,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.72,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.75,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "762x39",
      "label": "7.62×39",
      "group": "rifle",
      "basis": "bulk practice / FMJ",
      "firstYear": 1970,
      "series": [
        {
          "year": 1970,
          "usd_per_round": 0.18,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.182,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.184,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.186,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.188,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.19,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.192,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.194,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.196,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.198,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.196,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.192,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.188,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.184,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.18,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.176,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.172,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.168,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.164,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.16,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.156,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.152,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.148,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.144,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.14,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.134,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.128,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.122,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.116,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.11,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.114,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.118,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.122,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.126,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.13,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.14,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.15,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.16,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.17,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.18,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.19,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.4,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.34,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.28,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.22,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.2067,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.1933,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.18,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 0.42,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 0.75,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 0.55,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 0.42,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.4,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.41,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "65cm",
      "label": "6.5 Creedmoor",
      "group": "rifle",
      "basis": "cheapest available — no bulk-FMJ tier",
      "firstYear": 2008,
      "series": [
        {
          "year": 2008,
          "usd_per_round": 0.95,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.925,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.9,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.925,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.95,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 1.6,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 1.3833,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 1.1667,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.95,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.9167,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.8833,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.85,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.9,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 1.4,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 1.8,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 1.3,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 1.1,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 1.05,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 1.08,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "300wm",
      "label": ".300 Win Mag",
      "group": "rifle",
      "basis": "cheapest available — no bulk-FMJ tier",
      "firstYear": 1963,
      "series": [
        {
          "year": 1963,
          "usd_per_round": 0.4,
          "tier": "historical_catalog"
        },
        {
          "year": 1964,
          "usd_per_round": 0.4029,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.4057,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.4086,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.4114,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.4143,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.4171,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.42,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.433,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.446,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.459,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.472,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.485,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.498,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.511,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.524,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.537,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.55,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.557,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.564,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.571,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.578,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.585,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.592,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.599,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.606,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.613,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.62,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.628,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.636,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.644,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.652,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.66,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.668,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.676,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.684,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.692,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.7,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.72,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.74,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.76,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.78,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.8,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.85,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.9,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.95,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.9875,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 1.025,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 1.0625,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 1.1,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 2.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 1.8667,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 1.5333,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 1.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 1.1667,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 1.1333,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 1.1,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 1.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 1.8,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 2.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 1.6,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 1.4,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 1.35,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 1.38,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "338lapua",
      "label": ".338 Lapua",
      "group": "milsurp",
      "basis": "cheapest available — no bulk-FMJ tier",
      "firstYear": 1989,
      "series": [
        {
          "year": 1989,
          "usd_per_round": 2.5,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 2.5833,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 2.6667,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 2.75,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 2.8333,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 2.9167,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 3,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 3.04,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 3.08,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 3.12,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 3.16,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 3.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 3.32,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 3.44,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 3.56,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 3.68,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 3.8,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 3.9333,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 4.0667,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 4.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 4.275,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 4.35,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 4.425,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 4.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 6.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 5.9333,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 5.3667,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 4.8,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 4.7,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 4.6,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 4.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 4.8,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 7,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 8.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 6.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 5.8,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 5.6,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 5.7,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "50bmg",
      "label": ".50 BMG",
      "group": "milsurp",
      "basis": "cheapest available — no bulk-FMJ tier",
      "firstYear": 1921,
      "series": [
        {
          "year": 1921,
          "usd_per_round": 0.35,
          "tier": "historical_catalog"
        },
        {
          "year": 1922,
          "usd_per_round": 0.3516,
          "tier": "historical_catalog"
        },
        {
          "year": 1923,
          "usd_per_round": 0.3532,
          "tier": "historical_catalog"
        },
        {
          "year": 1924,
          "usd_per_round": 0.3547,
          "tier": "historical_catalog"
        },
        {
          "year": 1925,
          "usd_per_round": 0.3563,
          "tier": "historical_catalog"
        },
        {
          "year": 1926,
          "usd_per_round": 0.3579,
          "tier": "historical_catalog"
        },
        {
          "year": 1927,
          "usd_per_round": 0.3595,
          "tier": "historical_catalog"
        },
        {
          "year": 1928,
          "usd_per_round": 0.3611,
          "tier": "historical_catalog"
        },
        {
          "year": 1929,
          "usd_per_round": 0.3626,
          "tier": "historical_catalog"
        },
        {
          "year": 1930,
          "usd_per_round": 0.3642,
          "tier": "historical_catalog"
        },
        {
          "year": 1931,
          "usd_per_round": 0.3658,
          "tier": "historical_catalog"
        },
        {
          "year": 1932,
          "usd_per_round": 0.3674,
          "tier": "historical_catalog"
        },
        {
          "year": 1933,
          "usd_per_round": 0.3689,
          "tier": "historical_catalog"
        },
        {
          "year": 1934,
          "usd_per_round": 0.3705,
          "tier": "historical_catalog"
        },
        {
          "year": 1935,
          "usd_per_round": 0.3721,
          "tier": "historical_catalog"
        },
        {
          "year": 1936,
          "usd_per_round": 0.3737,
          "tier": "historical_catalog"
        },
        {
          "year": 1937,
          "usd_per_round": 0.3753,
          "tier": "historical_catalog"
        },
        {
          "year": 1938,
          "usd_per_round": 0.3768,
          "tier": "historical_catalog"
        },
        {
          "year": 1939,
          "usd_per_round": 0.3784,
          "tier": "historical_catalog"
        },
        {
          "year": 1940,
          "usd_per_round": 0.38,
          "tier": "historical_catalog"
        },
        {
          "year": 1941,
          "usd_per_round": 0.384,
          "tier": "historical_catalog"
        },
        {
          "year": 1942,
          "usd_per_round": 0.388,
          "tier": "historical_catalog"
        },
        {
          "year": 1943,
          "usd_per_round": 0.392,
          "tier": "historical_catalog"
        },
        {
          "year": 1944,
          "usd_per_round": 0.396,
          "tier": "historical_catalog"
        },
        {
          "year": 1945,
          "usd_per_round": 0.4,
          "tier": "historical_catalog"
        },
        {
          "year": 1946,
          "usd_per_round": 0.404,
          "tier": "historical_catalog"
        },
        {
          "year": 1947,
          "usd_per_round": 0.408,
          "tier": "historical_catalog"
        },
        {
          "year": 1948,
          "usd_per_round": 0.412,
          "tier": "historical_catalog"
        },
        {
          "year": 1949,
          "usd_per_round": 0.416,
          "tier": "historical_catalog"
        },
        {
          "year": 1950,
          "usd_per_round": 0.42,
          "tier": "historical_catalog"
        },
        {
          "year": 1951,
          "usd_per_round": 0.428,
          "tier": "historical_catalog"
        },
        {
          "year": 1952,
          "usd_per_round": 0.436,
          "tier": "historical_catalog"
        },
        {
          "year": 1953,
          "usd_per_round": 0.444,
          "tier": "historical_catalog"
        },
        {
          "year": 1954,
          "usd_per_round": 0.452,
          "tier": "historical_catalog"
        },
        {
          "year": 1955,
          "usd_per_round": 0.46,
          "tier": "historical_catalog"
        },
        {
          "year": 1956,
          "usd_per_round": 0.468,
          "tier": "historical_catalog"
        },
        {
          "year": 1957,
          "usd_per_round": 0.476,
          "tier": "historical_catalog"
        },
        {
          "year": 1958,
          "usd_per_round": 0.484,
          "tier": "historical_catalog"
        },
        {
          "year": 1959,
          "usd_per_round": 0.492,
          "tier": "historical_catalog"
        },
        {
          "year": 1960,
          "usd_per_round": 0.5,
          "tier": "historical_catalog"
        },
        {
          "year": 1961,
          "usd_per_round": 0.52,
          "tier": "historical_catalog"
        },
        {
          "year": 1962,
          "usd_per_round": 0.54,
          "tier": "historical_catalog"
        },
        {
          "year": 1963,
          "usd_per_round": 0.56,
          "tier": "historical_catalog"
        },
        {
          "year": 1964,
          "usd_per_round": 0.58,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.6,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.62,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.64,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.66,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.68,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.7,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.78,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.86,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.94,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 1.02,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 1.1,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 1.18,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 1.26,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 1.34,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 1.42,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 1.5,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 1.57,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 1.64,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 1.71,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 1.78,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 1.85,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 1.92,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 1.99,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 2.06,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 2.13,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 2.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 2.26,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 2.32,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 2.38,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 2.44,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 2.5,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 2.56,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 2.62,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 2.68,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 2.74,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 2.8,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 2.88,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 2.96,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 3.04,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 3.12,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 3.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 3.4,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 3.6,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 3.8,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 3.975,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 4.15,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 4.325,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 4.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 7,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 6.4,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
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          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 5.2,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 4.9667,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 4.7333,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 4.5,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 4.8,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
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          "tier": "tracked_retail"
        },
        {
          "year": 2022,
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          "tier": "tracked_retail"
        },
        {
          "year": 2023,
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          "tier": "tracked_retail"
        },
        {
          "year": 2024,
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          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 5,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 5.2,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "22lr",
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        },
        {
          "year": 1901,
          "usd_per_round": 0.0201,
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        },
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        },
        {
          "year": 1903,
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        },
        {
          "year": 1904,
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        },
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        },
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          "tier": "historical_catalog"
        },
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        },
        {
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        },
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        },
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        },
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        },
        {
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        },
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          "year": 1914,
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        },
        {
          "year": 1915,
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        },
        {
          "year": 1916,
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        },
        {
          "year": 1917,
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          "tier": "historical_catalog"
        },
        {
          "year": 1918,
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          "tier": "historical_catalog"
        },
        {
          "year": 1919,
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        },
        {
          "year": 1920,
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        },
        {
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          "tier": "historical_catalog"
        },
        {
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        },
        {
          "year": 1923,
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        },
        {
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        },
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        },
        {
          "year": 1926,
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        },
        {
          "year": 1927,
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        },
        {
          "year": 1928,
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        },
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        },
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          "year": 1930,
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        },
        {
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        },
        {
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        },
        {
          "year": 1933,
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          "tier": "historical_catalog"
        },
        {
          "year": 1934,
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          "tier": "historical_catalog"
        },
        {
          "year": 1935,
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        },
        {
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        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1938,
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        },
        {
          "year": 1939,
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        },
        {
          "year": 1940,
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
          "year": 1945,
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          "tier": "historical_catalog"
        },
        {
          "year": 1946,
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        },
        {
          "year": 1947,
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1950,
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          "tier": "historical_catalog"
        },
        {
          "year": 1951,
          "usd_per_round": 0.0133,
          "tier": "historical_catalog"
        },
        {
          "year": 1952,
          "usd_per_round": 0.0136,
          "tier": "historical_catalog"
        },
        {
          "year": 1953,
          "usd_per_round": 0.0139,
          "tier": "historical_catalog"
        },
        {
          "year": 1954,
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          "tier": "historical_catalog"
        },
        {
          "year": 1955,
          "usd_per_round": 0.0145,
          "tier": "historical_catalog"
        },
        {
          "year": 1956,
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          "tier": "historical_catalog"
        },
        {
          "year": 1957,
          "usd_per_round": 0.0151,
          "tier": "historical_catalog"
        },
        {
          "year": 1958,
          "usd_per_round": 0.0154,
          "tier": "historical_catalog"
        },
        {
          "year": 1959,
          "usd_per_round": 0.0157,
          "tier": "historical_catalog"
        },
        {
          "year": 1960,
          "usd_per_round": 0.016,
          "tier": "historical_catalog"
        },
        {
          "year": 1961,
          "usd_per_round": 0.0164,
          "tier": "historical_catalog"
        },
        {
          "year": 1962,
          "usd_per_round": 0.0168,
          "tier": "historical_catalog"
        },
        {
          "year": 1963,
          "usd_per_round": 0.0172,
          "tier": "historical_catalog"
        },
        {
          "year": 1964,
          "usd_per_round": 0.0176,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.018,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.0184,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.0188,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.0192,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.0196,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.02,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.0218,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.0236,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.0254,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.0272,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.029,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.0308,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.0326,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.0344,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.0362,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.038,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.0382,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.0384,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.0386,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.0388,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.039,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.0392,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.0394,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.0396,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.0398,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.04,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.0388,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.0376,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.0364,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.0352,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.034,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.0328,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.0316,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.0304,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.0292,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.028,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.027,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.026,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.025,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.024,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.023,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.0213,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.0197,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.018,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.0185,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.019,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.0195,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.02,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.085,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.075,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.065,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.055,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.05,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.045,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.04,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.042,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 0.09,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 0.12,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 0.08,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
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          "tier": "tracked_retail"
        },
        {
          "year": 2025,
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          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.056,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "12ga00",
      "label": "12ga 00 Buck",
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        },
        {
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          "tier": "historical_catalog"
        },
        {
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        },
        {
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        },
        {
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        },
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        },
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        },
        {
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        },
        {
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        },
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          "tier": "historical_catalog"
        },
        {
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        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1912,
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          "tier": "historical_catalog"
        },
        {
          "year": 1913,
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1915,
          "usd_per_round": 0.075,
          "tier": "historical_catalog"
        },
        {
          "year": 1916,
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          "tier": "historical_catalog"
        },
        {
          "year": 1917,
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          "tier": "historical_catalog"
        },
        {
          "year": 1918,
          "usd_per_round": 0.078,
          "tier": "historical_catalog"
        },
        {
          "year": 1919,
          "usd_per_round": 0.079,
          "tier": "historical_catalog"
        },
        {
          "year": 1920,
          "usd_per_round": 0.08,
          "tier": "historical_catalog"
        },
        {
          "year": 1921,
          "usd_per_round": 0.0805,
          "tier": "historical_catalog"
        },
        {
          "year": 1922,
          "usd_per_round": 0.081,
          "tier": "historical_catalog"
        },
        {
          "year": 1923,
          "usd_per_round": 0.0815,
          "tier": "historical_catalog"
        },
        {
          "year": 1924,
          "usd_per_round": 0.082,
          "tier": "historical_catalog"
        },
        {
          "year": 1925,
          "usd_per_round": 0.0825,
          "tier": "historical_catalog"
        },
        {
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1958,
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        },
        {
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        },
        {
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        },
        {
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        },
        {
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
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        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1967,
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          "tier": "historical_catalog"
        },
        {
          "year": 1968,
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          "tier": "historical_catalog"
        },
        {
          "year": 1969,
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          "tier": "historical_catalog"
        },
        {
          "year": 1970,
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        },
        {
          "year": 1971,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
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          "tier": "trade_ppi_indexed"
        },
        {
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.238,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.244,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.25,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.262,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.274,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.28,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.29,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.3,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.31,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.32,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.35,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
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        },
        {
          "year": 2010,
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        },
        {
          "year": 2011,
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          "tier": "tracked_retail"
        },
        {
          "year": 2012,
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        },
        {
          "year": 2013,
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        },
        {
          "year": 2014,
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        },
        {
          "year": 2015,
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        },
        {
          "year": 2016,
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        },
        {
          "year": 2017,
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          "tier": "tracked_retail"
        },
        {
          "year": 2018,
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          "tier": "tracked_retail"
        },
        {
          "year": 2019,
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        },
        {
          "year": 2020,
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        },
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        },
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        },
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        },
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        },
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        },
        {
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        }
      ]
    },
    {
      "key": "12gabird",
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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        },
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          "tier": "historical_catalog"
        },
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1967,
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          "tier": "historical_catalog"
        },
        {
          "year": 1968,
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          "tier": "historical_catalog"
        },
        {
          "year": 1969,
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          "tier": "historical_catalog"
        },
        {
          "year": 1970,
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          "tier": "trade_ppi_indexed"
        },
        {
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          "tier": "trade_ppi_indexed"
        },
        {
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.195,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.206,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.217,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.228,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.239,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.253,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.256,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.259,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.262,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.265,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.268,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.271,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.274,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.277,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.28,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.274,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.268,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.262,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.256,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.25,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.244,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.238,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.232,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.226,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.22,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
          "usd_per_round": 0.222,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.224,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.226,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.228,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.23,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.2433,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.2567,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.27,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.275,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.28,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.285,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.29,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.48,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.4267,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.3733,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.32,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.31,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.3,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.29,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.3,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 0.48,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
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          "tier": "tracked_retail"
        },
        {
          "year": 2023,
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          "tier": "tracked_retail"
        },
        {
          "year": 2024,
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          "tier": "tracked_retail"
        },
        {
          "year": 2025,
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          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.36,
          "tier": "tracked_retail"
        }
      ]
    },
    {
      "key": "20gabird",
      "label": "20ga Birdshot",
      "group": "other",
      "basis": "bulk practice / FMJ",
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        },
        {
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          "tier": "historical_catalog"
        },
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          "tier": "historical_catalog"
        },
        {
          "year": 1903,
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
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        },
        {
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          "tier": "historical_catalog"
        },
        {
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        },
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          "tier": "historical_catalog"
        },
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1911,
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          "tier": "historical_catalog"
        },
        {
          "year": 1912,
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          "tier": "historical_catalog"
        },
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          "year": 1913,
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          "tier": "historical_catalog"
        },
        {
          "year": 1914,
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          "tier": "historical_catalog"
        },
        {
          "year": 1915,
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          "tier": "historical_catalog"
        },
        {
          "year": 1916,
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          "tier": "historical_catalog"
        },
        {
          "year": 1917,
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          "tier": "historical_catalog"
        },
        {
          "year": 1918,
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          "tier": "historical_catalog"
        },
        {
          "year": 1919,
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        },
        {
          "year": 1920,
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        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1922,
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        },
        {
          "year": 1923,
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        },
        {
          "year": 1924,
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        },
        {
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        },
        {
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        },
        {
          "year": 1927,
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          "tier": "historical_catalog"
        },
        {
          "year": 1928,
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          "tier": "historical_catalog"
        },
        {
          "year": 1929,
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        },
        {
          "year": 1930,
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        },
        {
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        },
        {
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        },
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        },
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          "year": 1934,
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        },
        {
          "year": 1935,
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        },
        {
          "year": 1936,
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        },
        {
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        },
        {
          "year": 1938,
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        },
        {
          "year": 1939,
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        },
        {
          "year": 1940,
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        },
        {
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        },
        {
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        },
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        },
        {
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        },
        {
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        },
        {
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        },
        {
          "year": 1947,
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1949,
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          "tier": "historical_catalog"
        },
        {
          "year": 1950,
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        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1952,
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          "tier": "historical_catalog"
        },
        {
          "year": 1953,
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1955,
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          "tier": "historical_catalog"
        },
        {
          "year": 1956,
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1958,
          "usd_per_round": 0.0536,
          "tier": "historical_catalog"
        },
        {
          "year": 1959,
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          "tier": "historical_catalog"
        },
        {
          "year": 1960,
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          "tier": "historical_catalog"
        },
        {
          "year": 1961,
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          "tier": "historical_catalog"
        },
        {
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          "tier": "historical_catalog"
        },
        {
          "year": 1963,
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          "tier": "historical_catalog"
        },
        {
          "year": 1964,
          "usd_per_round": 0.0602,
          "tier": "historical_catalog"
        },
        {
          "year": 1965,
          "usd_per_round": 0.0615,
          "tier": "historical_catalog"
        },
        {
          "year": 1966,
          "usd_per_round": 0.0628,
          "tier": "historical_catalog"
        },
        {
          "year": 1967,
          "usd_per_round": 0.0641,
          "tier": "historical_catalog"
        },
        {
          "year": 1968,
          "usd_per_round": 0.0654,
          "tier": "historical_catalog"
        },
        {
          "year": 1969,
          "usd_per_round": 0.0667,
          "tier": "historical_catalog"
        },
        {
          "year": 1970,
          "usd_per_round": 0.068,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1971,
          "usd_per_round": 0.0732,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1972,
          "usd_per_round": 0.0784,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1973,
          "usd_per_round": 0.0836,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1974,
          "usd_per_round": 0.0888,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1975,
          "usd_per_round": 0.094,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1976,
          "usd_per_round": 0.0992,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1977,
          "usd_per_round": 0.1044,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1978,
          "usd_per_round": 0.1096,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1979,
          "usd_per_round": 0.1148,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1980,
          "usd_per_round": 0.12,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1981,
          "usd_per_round": 0.1225,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1982,
          "usd_per_round": 0.125,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1983,
          "usd_per_round": 0.1275,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1984,
          "usd_per_round": 0.13,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1985,
          "usd_per_round": 0.1325,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1986,
          "usd_per_round": 0.135,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1987,
          "usd_per_round": 0.1375,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1988,
          "usd_per_round": 0.14,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1989,
          "usd_per_round": 0.1425,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1990,
          "usd_per_round": 0.145,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1991,
          "usd_per_round": 0.1495,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1992,
          "usd_per_round": 0.154,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1993,
          "usd_per_round": 0.1585,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1994,
          "usd_per_round": 0.163,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1995,
          "usd_per_round": 0.1675,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1996,
          "usd_per_round": 0.172,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1997,
          "usd_per_round": 0.1765,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1998,
          "usd_per_round": 0.181,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 1999,
          "usd_per_round": 0.1855,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2000,
          "usd_per_round": 0.19,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2001,
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          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2002,
          "usd_per_round": 0.194,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2003,
          "usd_per_round": 0.196,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2004,
          "usd_per_round": 0.198,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2005,
          "usd_per_round": 0.2,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2006,
          "usd_per_round": 0.2133,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2007,
          "usd_per_round": 0.2267,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2008,
          "usd_per_round": 0.24,
          "tier": "trade_ppi_indexed"
        },
        {
          "year": 2009,
          "usd_per_round": 0.245,
          "tier": "tracked_retail"
        },
        {
          "year": 2010,
          "usd_per_round": 0.25,
          "tier": "tracked_retail"
        },
        {
          "year": 2011,
          "usd_per_round": 0.255,
          "tier": "tracked_retail"
        },
        {
          "year": 2012,
          "usd_per_round": 0.26,
          "tier": "tracked_retail"
        },
        {
          "year": 2013,
          "usd_per_round": 0.42,
          "tier": "tracked_retail"
        },
        {
          "year": 2014,
          "usd_per_round": 0.3733,
          "tier": "tracked_retail"
        },
        {
          "year": 2015,
          "usd_per_round": 0.3267,
          "tier": "tracked_retail"
        },
        {
          "year": 2016,
          "usd_per_round": 0.28,
          "tier": "tracked_retail"
        },
        {
          "year": 2017,
          "usd_per_round": 0.27,
          "tier": "tracked_retail"
        },
        {
          "year": 2018,
          "usd_per_round": 0.26,
          "tier": "tracked_retail"
        },
        {
          "year": 2019,
          "usd_per_round": 0.25,
          "tier": "tracked_retail"
        },
        {
          "year": 2020,
          "usd_per_round": 0.26,
          "tier": "tracked_retail"
        },
        {
          "year": 2021,
          "usd_per_round": 0.42,
          "tier": "tracked_retail"
        },
        {
          "year": 2022,
          "usd_per_round": 0.51,
          "tier": "tracked_retail"
        },
        {
          "year": 2023,
          "usd_per_round": 0.37,
          "tier": "tracked_retail"
        },
        {
          "year": 2024,
          "usd_per_round": 0.32,
          "tier": "tracked_retail"
        },
        {
          "year": 2025,
          "usd_per_round": 0.305,
          "tier": "tracked_retail"
        },
        {
          "year": 2026,
          "usd_per_round": 0.315,
          "tier": "tracked_retail"
        }
      ]
    }
  ]
}