What happens when you shoot the exact ammo trusted by the U.S. military? You get results that redefine accuracy in 5.56. The Black Hills Ammunition MK262 Mod 1-C uses a 77-grain Sierra Open Tip Match bullet and comes with a verified accuracy guarantee—we're talking ten 10-shot groups, hand-tested before it ever leaves the factory. In this video, we put that claim to the test. Using a precision rifle, chrono, and a lead sled, we evaluate consistency, velocity, and real-world accuracy with 10-shot