BIG Freakin’ Cartridge Test 010: Mk. 318 Mod. 0 62gr SOST (T556TNB1), 16″ and 20″ Barrels

By Nathaniel F

Next up for the Big Freakin’ Cartridge Test is Federal’s T556TNB1 load, which is the civilian market name for the Mk.318 SOST projectile developed by US SOCOM as a “barrier blind” round for the M4 Carbine and Mk. 18 CQB upper receiver. This ammunition uses a reverse drawn jacket to improve accuracy, and couples a fragmenting front end with a solid […]

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