Barnes Spit-Fire TMZ 50 Cal 290 Grain Muzzleloader Bullets are 100 percent copper bullets deliver outstanding accuracy, penetration and expansion. They feature a spitzer boat-tail design and polymer tip 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 percent 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. Barnes Spit-Fire TMZ 50 Cal 290 Grain Muzzleloader Bullets is intended for black powder muzzle loading rifle use. .50 Caliber 290 Grain 18 pack Polymer tipped Boat Tail Design Easier-loading sabots - even in tight bores Design reduces required ramrod pressure 100 percent copper bullets with polymer tips Mushrooms into six razor-edge cutting petals