All the commercial rifle barrel groove diameters I've measured are bigger than, and often lengths are shorter than, SAAMI spec test barrels. In contrast, most match grade barrel's groove diameters are usually smaller than specs for best accuracy.
If ammo makers use SAAMI spec test barrels establishing velocity data, most commercial barrels will shoot their bullets slower. Match grade barrels will shoot 'em faster
Last edited by Bart B.; November 23, 2019 at 12:41 PM.
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