The Barnes XPB .500 S&W bullets feature patented X-Bullet technology with 275-grain all-copper construction and flat base design for superior performance in hunting and self-defense applications.Barnes XPB .500 S&W (0.500'') 275-grain flat base bulletsAll-copper lead-free X-Bullet technology constructionDramatically increased penetration over conventional jacketed bulletsSuperior expansion and weight retention for maximum energy transferExceptionally accurate with no harmful residue20 bullets per boxIdeal for hunters and shooters seeking premium performance these lead-free bullets deliver unmatched penetration and expansion while maintaining accuracy and leaving no toxic residue in practice environments.