Quote Originally Posted by 243winxb View Post
What shoulder? Lol. 300 H&H

If one would study the SAAMI chamber headspace specifications, it shows a possible tolerance of .015" maximum. Slop in a loose chamber.

When head clearence is set by using a long head to shoulder measurement , minimul shoulder bump, THE AREA IN FRONT OF THE BELT BECOMES UNSUPPORTED. The brass will bulge after a few firings. The round will no longer chamber. Now you need the Willis tool.
I tried contacting Larry Willis several times to ask a couple questions on his collet die, still waiting for a response. For now I think I will try out a couple boxes of factory ammo and go from there, keep my brass and see what happens.