Mk 262

The Mk 262 (Mark 262) is a match quality 5.56x45mm NATO round manufactured by Black Hills Ammunition made originally for the Special Purpose Rifle (SPR). This round uses a 77 grain bullet that is more effective at longer ranges than the standard issue M855 round. The bullet is 24% heavier than the SS109/M855 62-grain bullet used in 5.56 mm NATO.

The Mk 262 mod 0, was initially adopted for special forces units for use with the Mark 12 Special Purpose Rifle 5.56mm sniper rifle. While some limited use has been made of the ammunition with [M4 Carbine|M4A1 carbine rifles]], the Mk 262 round remains primarily in use with 5.56mm sniper rifles and designated marksmans rifles. Despite numerous rumors and claims on the internet to the contrary, most units, even special operations units, continue to use standard M855 ammunition.

Two versions of the round have been procured to date. Initial production runs, designated Mark 262 Mod 0, lacked a cannelure. Subsequent production, designated Mk 262 Mod 1, added a cannelure to the bullet to improve seating in the cartridge case.

See also