Product InformationWolf Polyformance ammunition features a bi-metal bullet and steel case to provide an inexpensive option for high volume shooters. The Bi-Metal bullet consists of a lead core and a copper plated steel jacket. This affordable ammunition is loaded with high quality Wolf primers for reliable ignition and functioning in adverse conditions. The thin polymer coating helps to ensure smooth feeding and extraction. This ammunition is new production, non-corrosive, in non-reloadable steel cases. Technical InformationCaliber: 223 RemingtonBullet Weight: 55 GrainsBullet Style: Full Metal Jacket (Bi-Metal)Case Type: SteelBallistics Information: Muzzle Velocity: 3241 fpsMuzzle Energy: 1283 ft. lbs.