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FrankenMauser · April 28, 2017, 02:19 PM

Sounds like crimping while seating, possibly including some case length and/or neck wall thickness variation.

Back the die body off a quarter turn (~0.018"), readjust for seating depth, and give it another shot.

I never crimp rifle rounds while seating bullets, and rarely have the crimp ring anywhere close to the case mouth during the process. If I want to crimp, I do so as an additional step - even if it's just a little kiss to make sure things are consistent.

It could also be a bur left in the neck, if you didn't chamfer and debur after trimming.

April 28, 2017, 02:19 PM	#3
FrankenMauser Senior Member Join Date: August 26, 2008 Location: In the valley above the plain Posts: 13,774	Sounds like crimping while seating, possibly including some case length and/or neck wall thickness variation. Back the die body off a quarter turn (~0.018"), readjust for seating depth, and give it another shot. I never crimp rifle rounds while seating bullets, and rarely have the crimp ring anywhere close to the case mouth during the process. If I want to crimp, I do so as an additional step - even if it's just a little kiss to make sure things are consistent. It could also be a bur left in the neck, if you didn't chamfer and debur after trimming. __________________ -Unwilling Range Officer -Unwilling Match Designer -NRL22/PRS22/PRO -Something about broccoli and carrots