The .458 SOCOM (11.63×40mm) is a relatively large round designed to be used in the AR-15 platform. It achieves compatibility by utilizing a specially designed .458 bolt and barrel.


The .458 SOCOM cartridge was developed in response to the perceived lack of stopping power of the 5.56 NATO cartridge used in the M4 carbine and M16 rifle, particularly in close-quarters combat situations. The inspiration for its development came from the experiences of Task Force Ranger during Operation Gothic Serpent in Mogadishu. The goal was to create a cartridge that offered increased power and effectiveness.

The .458 SOCOM cartridge fires a 300-grain (19 g) bullet with a supersonic muzzle velocity of around 1,900 ft/s (580 m/s) and delivers approximately 2,405 ft⋅lbf (3,261 J) of energy. This places it in the same power range as a light .45-70 Government cartridge, despite having a smaller case.

Marty ter Weeme of Teppo Jutsu and Tony Rumore of Tromix were involved in the development of the .458 SOCOM cartridge, with Tromix being contracted to build the first .458 SOCOM rifle in February 2001.

The .458 SOCOM has gained popularity among users who desire increased stopping power and terminal ballistics in the AR-15 platform, particularly for hunting or self-defense purposes.


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