Studly . . .
Have a 12" T/C G1 Contender barrel (factory ported) that Bellm rechambered to SuperMag for me. Started by using H110, but the muzzle flash was too much for me. Settled on IMR-4227 and it was bearable. Gave up 100 fps IIRC.
My loads were from the Sierra Handgun manual. Would post them up, but I'm on vacay. The thing about 4227 is you don't really need the heavy crimp that 110/296 requires, so you can seat the bullets out further for more case capacity. Sierra tested with the Dan Wesson wheel gun and I'd guess you can load somewhat higher for your Pro-Hunter. The Starline brass is pretty robust.
