I drank the rim thickness gaging KoolAid for a while, in my Winchester M/52 Sporter and my Springfield 1922 M2 Sporter unsorted CCI Std. Vel. gave best accuracy at 50 yds.. I shoot rimfires off the bench for enjoyment and am not in search of gilt edge accuracy. If I do my part both rifles will group 50 shots into one ragged hole, the rifles are both equipped with Lyman Alaskan 2.5x scopes.