I started working loads up for my 50/80 mauser and I think I am going to get a Lee 459-405-HB and try paper patching to get it up to inside cartridge diameter of .503 . What weight would be most practical for the 1 in 48 twist. I will plane the mold off to get as close to the best weight as possible while still retaining a flat base. Is this mold even practical for my concoction of a gun? I want to stay on the lighter side if possible.