A 450 Bushmaster would be easy. Guys have been cutting 30-06 brass off at the shoulder and making rimless 444s too if you reload.
I figured on reloading. Is a rimless .444 (Marlin, I'm guessing?) pretty well established as far as being easy to reload for? I'd like to use cast bullets and 1800 fps would be plenty. Do you have to rework the action rails to get them to feed?
