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The thing that make me go hmmmm is this: If these cases expand to my chamber's dimension and then spring back a tad each time they are fired, isn't that akin to running them in a custom sizing die each time I shoot... ie., my chamber? How then does the brass end up "too tight" after being fired if the trim length is good, and it "shrinks back" a tiny bit after firing?
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Did you notice that although the cartridge is getting more difficult to close/lock the bolt on after several firings, after you fire the cartridge, it seems to come out of the chamber (and will go back in the chamber easily empty also, as long as you do not size the case), without undue effort?