Yes! A good seal is important. The first time I fired these shells it was with Black Powder and the action looked like there was a fire inside with the all the smoke coming out of it after each shot. The smaller gauge fire formed itself to the action. I shot smokeless powder after that and had no problems until after I had shot them a number of times and the bulge became apparent. I just looked through all the load data I have for turned brass cases and nitro powder. All loads were with SP10 wads.
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Threaded Mode