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Old January 26, 2021, 10:00 PM   #2
cdoc42
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Join Date: March 13, 2005
Location: Pennsylvania
Posts: 1,109
Why?
A 9mm case requires a #16 RCBS shellholder while the .380 needs a #10. If you trim the 9mm down you will invariably risk a potential overload with a "new".380 case while you are actually loading 9mm rounds.

If you leave the 9mm case as is, all you might accomplish is loading down a 9mm to make it a short with more air space between the bullet and powder which has its own issues. Why not just settle for the .380 cases?
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