Lyman Great Plains Rifle in .54 caliber flintlock configuration. Preferred by hunters and traditional black powder enthusiasts who want the largest bore available with authentic flintlock ignition. Type: Muzzleloader Action: Flintlock Caliber: .54 Cal Black Powder Capacity: 1 Year introduced: 1980, USA Weight: 70 oz Overall length: 50.5" Status: Active Intended use: Hunting, Target Shooting, Collector