The .223 Remington is a rifle cartridge, originally developed in 1957 as a commercial hunting bullet for small mid-western varmints; with the first rifle chambered for it coming out in 1963. It has continued to be a popular civilian hunting cartridge.
Bullet diameter:Â 0.224 in (5.7 mm)
Case length:Â 1.76 in (45 mm)
Case capacity:Â 28.8 grain H2O (1.87 ml)
Parent case:Â .222Â Remington
Maximum pressure (SAAMI):Â 55,000 psi (380 MPa)
Shoulder diameter:Â 0.354 in (9.0 mm)
Rim diameter:Â 0.378 in (9.6 mm)
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