cast bullet with cast check dimension request

[BJung]

Can someone who has a cast .357, 9mm, and 40 cal cast bullet that takes a gas check give me the diameter of the bullet that the gas check presses on to?

Thanks so much.

[Gamsek]

I don’t know if this helps but it won’t hurt either

[BJung]

OK, that can help. Thanks. I'm thinking of buying and using an RCBS neck turning attachment and shaving off part of the base for the gas check. As for the bullet, I tap a bullet nose first into the case or press the cast bullet in the case with a die, then attach the case to the hand lathe chuck. Does it sound possible? Does anyone already have an RCBS neck turning attachment to try it?