Yesterday I picked up the .455 cases that a friend cut down from .45 Colt. I gave him a couple of Dominion .455 cases and he went to work. He even borrowed a case trimmer from another mutual friend and cut them to exact length. I think I'll be taking him and his wife to lunch today after church!
I just ran them thru' a .45 Colt carbide sizer die and they chamber beautifully in all my .455 revolvers. I have 100 such cases from a previous operation and at .455 pressures, I expect they will last as long as I need them.
For the record, he says he needed to reduce the rim thickness of the once-fired Starline brass by 14 thou. Don't bother using collectible Dominion brass or buying expensive Fiocchi brass primed with small pistol primers.