While I never measured them myself, CCI standards are reported to have thick rims which can give extraction/ejection hic-ups in some rifles.. I can tell you that they are the ONLY round to give me issues with positive extraction in my Savage B22 Precision. Fortunately, they are not the most accurate in this rifle so there is no need to chase that ghoul.I went down to .005 for shims which I think sets HS for .040. It worked fine yesterday with 1 ejecting problem with Eley match.I sanded down barrel channel a little, put limbsaver on barrel and back to range. R50 were flawless, CCI was hard closing bolt and wouldn't eject all 3. Federal UM was no problem for all 7. Eley match which I want for that rifle was terrible today from the first shot that didn't want to eject. I think I went through 15 with 4 extracting properly. Came home and examined bolt, I couldn't find anything wrong. Time to talk to Carson? R50 averaged about 1moa today compared to about 1.25moa yesterday (limb saver).
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