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

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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The post BIG Freakin’ Cartridge Test 010: Mk. 318 Mod. 0 62gr SOST (T556TNB1), 16″ and 20″ Barrels appeared first on The Firearm Blog.


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