Compatible with 0.36, 0.44, 0.45, 0.50 and 0.54 caliber black powder firearms, the Speer® Muzzleloading Black Powder Lead Round Balls are made through a cold-swaging process that helps eliminate voids and creates a consistent uniform, round shape. 100-round box. Speer Muzzleloading Black Powder Lead Round Balls, 144 - Black Powder Guns at Academy Sports