I am not re-forming the Cases to a smaller diameter.
I have to re-form or expand them to be a little larger diameter.
I doubt I will have any need to re-form them after they are fired - Fire-Formed. If I were to wish to do so, no one makes any such Dies anyway, and I would have to make my own Die.
Cases need to be same diameter as .38 S & W...the Revolver is meant for an obsolete Cartridge which was same diameter as .38 S & W, but much longer.
.357 Maximum Cases are all I can think of to work with for this, and they are too small a diameter to accept .361 Bullets.
These are Black Powder Revolver Cartridges.