Why not use 260 Lapua brass?
Just be carefull your case necks are not to thick, you may have to inside neck ream...
Why would one want to inside neck ream? Why would anyone want to do ANYTHING to the inside of a case neck for that matter other than clean it?
If the brass is too thick then get a neck turning kit and turn the OUTSIDE and leave the inside (the part that holds onto the bullet) as is.



























