People have shot .3092" diameter Lapua 185 grain FMJRB match bullets in barrels with.3075" groove diameters without issues.
SAAMI specs for most 30 caliber bullets are .306" to .309". Groove diameters .308" to .310.
USA military 30 caliber bullet diameters range from .3070" in service ammo to .3086" in match ammo.
SAAMI specs for most 30 caliber bullets are .306" to .309". Groove diameters .308" to .310.
USA military 30 caliber bullet diameters range from .3070" in service ammo to .3086" in match ammo.
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