.223 Remington
| .223 Remington | ||||||||||||||||||||||||
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A variety of .223 Remington cartridges with a .308 Winchester (right) for comparison | ||||||||||||||||||||||||
| Type | Rifle | |||||||||||||||||||||||
| Place of origin | United States | |||||||||||||||||||||||
| Production history | ||||||||||||||||||||||||
| Designer | Remington Arms | |||||||||||||||||||||||
| Designed | 1962 | |||||||||||||||||||||||
| Produced | 1964–present | |||||||||||||||||||||||
| Variants | 5.56×45mm NATO | |||||||||||||||||||||||
| Specifications | ||||||||||||||||||||||||
| Parent case | .222 Remington | |||||||||||||||||||||||
| Case type | Rimless, bottleneck | |||||||||||||||||||||||
| Bullet diameter | .2245 in (5.70 mm) | |||||||||||||||||||||||
| Land diameter | .219 in (5.56 mm) | |||||||||||||||||||||||
| Neck diameter | .253 in (6.43 mm) | |||||||||||||||||||||||
| Shoulder diameter | .3542 in (9.00 mm) | |||||||||||||||||||||||
| Base diameter | .3759 in (9.55 mm) | |||||||||||||||||||||||
| Rim diameter | .378 in (9.60 mm) | |||||||||||||||||||||||
| Rim thickness | .045 in (1.14 mm) | |||||||||||||||||||||||
| Case length | 1.760 in (44.70 mm) | |||||||||||||||||||||||
| Overall length | 2.260 in (57.40 mm) | |||||||||||||||||||||||
| Case capacity | 28.8 grain H2O (1.87 ml) | |||||||||||||||||||||||
| Rifling twist | 1 in 12 in (305 mm) (military-style rifles use 1 in 7 in (178 mm) to 1 in 10 in (254 mm) to stabilize longer bullets) | |||||||||||||||||||||||
| Primer type | Small rifle | |||||||||||||||||||||||
| Maximum pressure (SAAMI) | 55,000 psi (380 MPa) | |||||||||||||||||||||||
| Maximum pressure (CIP) | 62,366 psi (430.00 MPa) | |||||||||||||||||||||||
| Maximum CUP | 52000 CUP | |||||||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||||||
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| Test barrel length: 24 inches (61 cm) Source(s): | ||||||||||||||||||||||||
The .223 Remington designated 223 Remington by SAAMI and 223 Rem. by the C.I.P., (pronounced "two-two-three") is a rimless, bottlenecked, centerfire intermediate cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm. The .223 Remington is considered one of the most popular common-use cartridges and is used by a wide range of semi-automatic and manual-action rifles.