The Lyman Great Plains Rifle in .54 caliber uses the same 32-inch tapered octagonal barrel platform as the .50 caliber, optimized for the heavier .54 bore patched round ball preferred by hunters taking large game. The .54 caliber Great Plains is one of the few production traditional percussion rifles that handles round ball and conical bullets equally well. Type: Rifle Action: Single Shot Caliber: .54 Cal Capacity: 1 Year introduced: 1981, USA Weight: 11 oz Overall length: 50.5" Status: Active Intended use: hunting, collector, muzzleloader, Hunting, Target Shooting, Collector