I’m noticing an accuracy difference on paper between new brass and resized brass and trying to figure out the culprit. This is 223 Lapua brass and 69gr smk’s. New brass that has been expander mandreled and dechamfered/deburred shoots an .3” at 100. Once fired brass is double that plus some in some groups. I’m punching the primer, then annealing in my amp then resizing to .002 bump from the shoulder without the expander ball and then trimming to 1.75” and dechamfering etc and then expander mandreling the neck. I’m checking my bump with a Whidden bump gauge and it’s consistent. Yet the groups are doo doo. Any advice? Any thing to look into? I’m getting new brass shoulder at 1.4425-1.4430. Fired is 1.445-70. I’m also seating to the same depth from ogive.