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Can I jump in here and get a clarification that was touched on earlier?
I finally got my stamp for my Palladin 300/221 9.5" AR15 barrel and have not had time to make any ammo for it. The question is, can I run subsonic 300BLK in it until I reload for it and will the brass be fire-formed and ready to go or need trimming to 1.355?
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