Quote Originally Posted by Slapps74 View Post
Just supers and I'm all ears if your willing to share. Found some data that I think I like. AA1680 19.5-21.7 grains, OAL of 2.140 with 150 grain Sierra fmjbt. I have Hornady bullets but it should be close enough. I pressed one in a case last night that I didn't run the expanding ball thru. Case mouth measured .295 and the bullet went in fine and didn't split the case but not sure if .013 is too much neck tension or not.
21.0 gns worked for me. With a short barrel they were running just under 2,000. That was with 147 surplus pulldowns.

.013 neck tension is a lot. But if it works, it works. You are just working the neck more than you need to. You might split a neck or two after a few reloads.