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Picture for category .223 Remington

.223 Remington

The .223 Remington is a rifle cartridge, developed in 1957, for the ArmaLite AR-15. In 1964, the ArmaLite AR-15 was adopted by the United States Army as the M16 rifle, and it would later become the standard U.S. military rifle. Wikipedia
Case length: 1.76 in (45 mm)
Rifling twist: 1 in 12 inch (military-style rifles use 1:7 to 1:10 to stabilize longer bullets)
Maximum pressure (SAAMI): 55,000 psi (380 MPa)
Shoulder diameter: 0.354 in (9.0 mm)
Rim diameter: 0.378 in (9.6 mm)
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