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 [Read More…]