I have heard of people having 9.3X62 boolit molds made, and they had them make the gas check part fit a .375 GC. I understand it would be great because you could use whatever brand you wanted, but how does that work out, when it is swaged down in the sizer, dos the check bow in or out, will it bounce back and end up oversize? I guess annealing would fix that, but do they hold on as well as if it was just a reg. mold and reg. 9.3 GC? I will be getting a CZ550 in 9.3X62 in a few months and I was just curios about it. and to the person on here that sells checks, do you make them in copper? I don't remember if I asked. thanks a lot, Travis