I found a guy through Gary Reeder custom guns named Jack Huntington in California(530 268-6877). Jack is building .480 REDHAWKS. Not Super Redhawks, but Redhawks. He apparently has been testing .475 etc in Redhawks and says the .480 is no problem. He will do rebored 6 shots original cylinder or a new five shot cylinder. He says all the math and range tests work on cylinder demensions and pressure etc. Anyone got any thoughts?