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I had the same issue with 10mm brass out of a G20. The culprit turned out to be my Dillon sizing die, which, like many brands, didn't size all the way down the case. I switched to Lee dies which size further down the case and haven't had an issue since.
In my experiementing, I did buy a bulge buster, which I now use for periodically deburring my 10mm brass. I also use a Lee Factory Crimp die, but only for crimping, because the brass is probably sized it doesn't touch the sizing ring.
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