3. The ammunition loaded for the M60 machine gun was a larger diameter, .3086, to give good accuracy as the barrel heated and the bore diameter increased during sustained firing. It operates at 65,000 PSI, and was found to give excellent long range accuracy in the match bolt rifles of the 1960s, so it was issued to snipers for their bolt actions.
Oh yeah.
I forgot about the match grade machine gun ammo....
Those machine guns are designed for pinpoint accuracy, and require some highly accurate, mass produced by the millions, bullets...
