I've read a lot of how to's, what if's, and don't evers. I've shot cast in 30 Carbine revolvers but have never done it in an M1 carbine, gas operated and all. Please fill me in and bring me up to speed. How hard should I cast, gas check required or just suggested??? I have two mold that are good for the little gun, both gas checked that I use in other applications. I'm open, please educate me.