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458 SOCOM Ammo
The .458 SOCOM [11.63 x 40 mm] is a moderately large round designed for a specialized upper receiver that can be mounted on any AR-15 pattern lower receiver. The 300-grain (19 g) round offers a muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft·lbf (3,261 J).