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.458 SOCOM
Rifle cartridge / From Wikipedia, the free encyclopedia
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The .458 SOCOM (11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform. This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J),[1] similar to a light .45-70 but with a much smaller case.
Quick Facts Type, Place of origin ...
.458 SOCOM | ||||||||||||||||||||||||
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![]() 55gr 5.56 NATO vs 500gr .458 SOCOM | ||||||||||||||||||||||||
Type | Rifle | |||||||||||||||||||||||
Place of origin | United States | |||||||||||||||||||||||
Production history | ||||||||||||||||||||||||
Designer | Teppo Jutsu LLC | |||||||||||||||||||||||
Manufacturer | Southern Ballistic Research (SBR) Steinel Ammunition Inc | |||||||||||||||||||||||
Specifications | ||||||||||||||||||||||||
Parent case | .50 Action Express | |||||||||||||||||||||||
Case type | Rebated, bottleneck | |||||||||||||||||||||||
Bullet diameter | 11.63 mm (0.458 in) | |||||||||||||||||||||||
Neck diameter | 12.32 mm (0.485 in) | |||||||||||||||||||||||
Shoulder diameter | 13.49 mm (0.531 in) | |||||||||||||||||||||||
Base diameter | 13.74 mm (0.541 in) | |||||||||||||||||||||||
Rim diameter | 12.01 mm (0.473 in) | |||||||||||||||||||||||
Rim thickness | 1.04 mm (0.041 in) | |||||||||||||||||||||||
Case length | 40.00 mm (1.575 in) | |||||||||||||||||||||||
Overall length | 57.40 mm (2.260 in) | |||||||||||||||||||||||
Case capacity | 3.96 cm3 (61.1 gr H2O) | |||||||||||||||||||||||
Rifling twist | 1 in 14" (most common) or 18" | |||||||||||||||||||||||
Primer type | Large Pistol | |||||||||||||||||||||||
Maximum pressure | 35,000 psi (241 MPa) | |||||||||||||||||||||||
Ballistic performance | ||||||||||||||||||||||||
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