7.62 x 51 mm, 7.62 NATO and .308 Winchester. The round works in the M60 and M240 machine guns and a host of 7.62mm rifles, including the M24 sniper rifle and M110 sniper rifle.

The UR-10 uses 7.62x51 mm NATO /.308 Winchester ammunition and is fed from magazines with a capacity of 10, 20, or 25 rounds.