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#1. How do I seat a gas check on the base of a HP bullet that is sized to .460? Don't all .45-70 gas checked molds have a check groove that is designed for a .458 check? Obviously my .460 Lee sizer die wouldn't touch it, and my .458 die would muss up the bullet diameter
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The base of a gas check bullet is rebated to accept the
inside diameter of the check. The
outside diameter of the modern, crimp-on, unsized check is larger than the bullet itself and is always large enough that it will be sized smaller when pushed through a bullet sizing die. When you apply the gas check to your unsized, .460 diameter bullet, you will notice that it sticks out, beyond the bullet until it is sized.
Back in the day of the Lyman non-crimped on checks and Lyman molds that were way-oversize, that problem you envision may have existed, but with only .002 diameter from nominal size bullet and the thickness of crimp-on gas checks, I doubt if you will have any problems.