I'm just getting started reloading. I've read that when firing cases for the first time, loading to a particular rifle's chamber OAL will produce more concentric formed necks. But, my HS Precision 300wsm has a detachable magazine that is .10 off the lands than the rifle's chamber OAL. My accuracy with max mag length is good, but I want to know if I should fire-form my brass at chamber OAL first before loading at the shorter magazine length. I'd rather not get into neck turning now if I can avoid it . . .
Thanks for the help.
Thanks for the help.