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I have two molds marked 31141 and 311041, same mold plus a clone made by the now defunct NEI and I've never been able to get any one of those to shoot worth schitt. Not in the 30-30, .303 Savage when I had one nor the .308 and 30-06.

Pic I posted earlier with the levermatic was shot with the 311041 w/gas check.

It is my preferred bullet for the .30 Sneezer on the 50 yard butt for obvious reasons....no gas check.
[Linked Image from i.imgur.com]

Guess on my part, but you might want to check fit and/or take a look at your alloy hardness.

I am..........disturbed.

Concerning the difference between man and the jackass: some observers hold that there isn't any. But this wrongs the jackass. -Twain