Why not just buy a gun and cartridge that is engineered to do what you want to do? Maybe a .460 or .500?

I do not own a Freedom Arms revolver. Sometimes I wish I did, but I’m just not really a single-action man. I do know a little bit about the materials used and how they’re made. If you just have to abuse your hands and wrists with unsafe, over-pressure .44 Magnum ammunition, or normal pressure .454s for that matter, I’d say the Freedom Arms revolver is your gun. I don’t understand the fascination with this endeavor, but maybe in due time you’ll get over it.

FWIW, be sure to keep the delinquent .44 loads you make clearly labeled and separate from other .44 ammunition. Every one you make is a potential disaster waiting to happen.