My rifle did the exact same thing. The marks would show up in the same spot on the bullet whether you rotated it before re-chambering or not. This was with rcbs neck dies. I found if I set my sizing die to the absolute minimal setting it helped a lot. I set so you barely feel the Rock Chucker cam over on the bottom of the die. Then set the decapping pin so it was just deep enough to release the primer. I still noticed some rounds were tighter than others but amazingly never noticed a difference in accuracy. At 700 yards the gun would shoot .5-.7 moa scuff marks or not. This gun has thousands of rounds through it and this issue never lowered the brass life either. They were also as you described, stiff bolt close and even worse to open. If ejecting an unfired round that was tight it would take a couple smacks with my palm to get the bolt back.

Hope this helps hafejd30