New Unfired Brass Can Make All The Difference In The World If You Don't Prep It First
I always run new brass through the FL sizer and expander, then carefully champher the case mouth. This of course assumes the brass doesn't need trimming after sizing. Most does not but I've seen plenty that did. If you look carefully at new brass almost all the case mouths are out of round. The sizing and expanding cures that of course.
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