There was a time when I spent hours with the Wilson trimmer, trying to machine the heads of PPC cases flat. Not sure if it made a lot of difference, but benchrest is a bit of a mental game.
I thought about trying the same thing with hornet and bee brass, uniformity and all of that stuff. I finally, slowly, came to conclusion to quit trying to make my chambers meet the brass dimensions. Rims do vary it seems. So I have gone to the shouldered methods for holding the case in the chamber, and the rim cut becomes a don't care at least for me.
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