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Old November 28, 2012, 11:39 AM   #5
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Join Date: October 23, 2011
Location: Backwoods, PA
Posts: 284
I think you are on the right track with the case walls thinning after many uses. every time you trim a case you are obviously loosing brass so even cases only trimmed a few times are thinning out. Even the act of opening and closing the case mouth is slowly forcing the brass down.

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