Tha standard modification to the 455 was to convert to 45 Auto-Rim or 45 Long Colt. The cylinder was shaved to accept the thicker rims and I think both required some chamber rework, since both casings are longer than the 455.

I am sure that you could chamber 455 in them, unless the cylinder was adapted to take moon-clips, but the chambers might be a little big, so a split case could be a possibility. Other problem is that the firing pin might not hit the primer with enough force, given it would be farther away with the shortened cylinder