[elkhunter11]

As has been mentioned, it could be the seating die adjustment, but I had the same issue when helping a friend load some 270wsm, using his RCBS dies. The die was reducing the neck diameter too much, and the excessive neck tension was causing this. I added even more chamfer to the neck, but that didn't help, so I ended up having to use graphite on the inside of the neck and bullet, and seat the bullets in steps while rotating the case for each step. We managed to seat enough bullets for his test loads, but I brought my Redding dies along for the next loading session, and the issue disappeared , because the neck tension was much less.
How much effort did it take to seat the bullets? Wen I seated bullets after sizing with the RCBS dies, it took much more effort to seat the bullets, because of the excess neck tension.