Gas check dislodging concern

[Rocky Raab]

It is possible. Because the neck enters the die from the top down, the die creates the equivalent of the way your bowels work: stuff gets pushed along by contraction of the walls.

So it is possible that the gas check may get pushed off. Pulling a few bullets to find out wouldn't prove anything, because pulling them back through the neck might in fact unseat the gas check by itself.

The only way to really determine if the gas check is still in place after the crimping stage would be to x-ray them. That's hardly feasible.

I'd see if the Lee folks (or a good machinist) could open up the walls of the crimp die a few thousandths. That wouldn't affect the crimp action at all and would relieve your tight fit problem.