I understand that, however, I don't normally use 73's for CAS. Also I like to get the most accuracy possible. And I have and do occasionally shoot pistols at 100 yard targets. And while most pistol shooting is 20-30 yards on steel in my back yard I sometimes like to see what there capable of. With modern manufacturing there's no excuse for way oversize chambers, at least not on a gun as expensive as the Colt. Do they hold there tolerances, or are they all over the place gun to gun?