First I would like to thank the members who responded to my inquire about reloading RMR hardcore match RNFP.While I was looking going thru some of the threads on this web sight brass was in one of them so I changed to Starlight I was no longer getting spring back. What was happing the only way to get them to fit gage was over crimp that of course deformed the bullet. I would like to say a little about my self I turned 73 on the 12 of Sept. this year. I have been retired for 15 years from GM as a tool & die maker thank you all again.

HI  new to 10 mm just bought some RMR hardcore match RNFP .401 dia having hard time trying to reload any suggestion the cases go over size and will not chamber do the .401 need to be resized to.400.
Tnredneck