I have read posts here and on other forums but I'm still not getting it. I purchased one of those Hornady cartridge headspace/clearance kits to set my FL sizing die up with and my measurements on once fired brass (my bolt rifle) vary from 1.624 to 1.632 with the average being 1.627. My dial caliper is spot on in that it measures the kit at exactly 2" every time.

Do I just take the average and set my die up to bump the shoulder back to 1.625 or do I take the shortest measurement and bump 'em all back to that less .002? I would have thought the brass would be more consistent (Remington) being it's formed in my rifle but what do I know.

If there is a thread that answers this please point me towards it.