Quote Originally Posted by m12lrs View Post
So you feel you were.collapsing the shoulder when seating you bullets? That certainly would cause problems. Do you still have any of those loaded rounds you can check? Simply use your headspace gauge on a resized.case.and a loaded round
No, None of the necks collapsed. I'm just assuming that as tight as the bullet fit into the neck that it had to put undue downward pressure that could have set the neck and shoulder back a bit. I have a headspace gauge that I set up the FL die with but I don't recall ever measuring a loaded round to see if there is any difference. I will check that out.