.223 Ammo Features American made and military grade are the hallmarks of Frontier Cartridge. This line of ammo gives shooters the best of both worlds. It is configured for a wide range of shooters and applications from target/match shooting to varmint hunting. Frontier Cartridge features brass cartridge cases and military grade boxer primers and propellant. .223 Ammo Specifications Caliber: 223 Rem Model: Rifle Bullet Weight: 68 gr Rounds Per Box: 20 Casing Material: Brass Application: Varmint Target Bullet Type: Boat-Tail Hollow Point Match Muzzle Energy: 1282 ft lbs Muzzle Velocity: 3240 fps