I'm assuming that because the S&W .460XVR revolver can also chamber the .454 and .45 Colt, that the Encore/Contender chambered in .460 can also accomodate the others as well? I would think if you use the barrel designed for the higher chamber pressure you'll be good to go.
I currently have rifle barrels in .204 and .308 and a pistol barrel in .308
I currently have rifle barrels in .204 and .308 and a pistol barrel in .308