As American as 45Auto, .223Rem (5.56x45) has been the standard round of the US military for over 55 years. Developed for the original AR-15, .223 Remington has become one of the most popular sporting rounds with shooters and hunters in the United States. This lightweight, high-velocity round lends itself to being chambered with various styles of rifles from bolt action to semi-auto and belt-fed.
Ballistic Coefficient (G1): 225
Muzzle Velocity V0 ft/sec: 3,261
Muzzle Energy E0 J ft/lb: 1,299
Max Powder Pressure Bar (lb/inch2): 58,015
Cartridge Max Length: 2.26 inches
Cartridge Average Weight: 164 grains
Rounds per Box: 20