I just sent my No.1T .458 WM to SSK/JD Jones for a re-chamber to .450 #2. I'll let you guys know how it turns out. Hamilton Bowen came to mind initially, but he has ceased working on rifles. Have dies & brass in hand, and ready to go. I may stick some weight in the butt. I like a rifle to be muzzle heavy, but the No.1T is a little to muzzle heavy for my tastes.

Jeff