The Spit-Fire TM 50 Cal 285 Grain Muzzleloader Bullets are 100% copper bullets deliver outstanding accuracy, penetration and expansion. They feature a spitzer boat-tail design that deliver flatter shooting performance. Recommended for use in in-line muzzle loaders, these bullets expand up to double their original diameter and retain nearly 100% of their weight. The result is incredible terminal performance and quick, humane kills. Snug-fitting sabot prevents gas blow-by, ensuring consistent velocities and tight groups. The Spit-Fire TM 50 Cal 285 Grain Muzzleloader Bullet is intended for black powder muzzle loading rifle use.