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I got rid of donuts in a 30BR by sizing after firing and then running the 30BR tapered expander through the necks again.  This brought the donut effect to the outside of the neck.  Then I trimmed it off with my neck turning stuff.  I cut just the excess brass pushed to the outside, at the joint where the neck meets the body.  I had already turned my necks to the thickness I wanted.  Don't see why it wouldn't work with any cartridge.


Tom


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