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their headspace is short enough you can use either. the main issue with commerical ammo in the M1A is the possibility of slam-fires with mreo sensitive commerical primers is much greater than with less sensitive military primers. it's interesting that a lot of surplus is more consistent in the critial dimensionsal areas than commerical ammo.
http://www.fulton-armory.com/308.htm
http://www.fulton-armory.com/308.htm