Gadd's custom Cartridges show a heeled bullet on their website. One of the available .44 Colt heeled bullets might work
I seem to recall reading Pony Racers account of his efforts and it sounded like a bit of a journey. I can't locate it now, but I seem to recall that one way to make some noise with thes ol' thangs is to press a .451 round ball on top of a .44 S & W case shortened the right amount.
I've wondered, since I have a .41LC, if cable crimpers for electronics might be adaptable to case crimping
I forget who, but someone alters LEE crimp dies for use with heeled cartridges. I have an M 83 Reichsrevolver. Luckily it takes standard .44 Russ. cases and .432 bullets.