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I use LC brass all the time with Redding dies but not in one of tp555's 300/221 barrels. I have had him do other chamberings for me with never a problem.
Lots of people have problems with brass in ARs and resort to a small base die or some mill down a shellholder a few thousandths (my fix) but I have never had a problem with the 300/221 Redding dies. Since it still doesn't gauge right it sounds like it needs a little more sizing.
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