Federal Premium Triple-Shock 223 Remington Ammo 55 Grain Barnes Triple-Shok offers the following information; For nearly a century Federal Ammunition has put its focus on manufacturing quality products with cutting-edge technology. This dedication to excellence has given Federal a competitive edge as an ammunition technology giant. Today the company is well known for producing high-grade centerfire, rimfire, and shotshell ammunition that shooters everywhere know and trust. This 223 Rem round by Federal features Barnes’ 55-grain TSX (Triple-Shock X) projectile. Its Utahn creator’s most popular hunting bullet, the TSX is made entirely of copper to greatly reduce bore fouling and comply with California’s lead ammunition ban. The monolithic TSX further renders the problem of core/jacket separation totally irrelevant, so your shot will retain up to 100 percent of its weight as it deeply penetrates a target.