There is one of those in a ruger blackhawk at my gunrunners shop !
Cool looking , yet I know squat about that caliber.....will read up !
The Ruger Black Hawk was offered with a spare 9 mm cylinder for some reason. So the .357/.44 B&D was wildcatted as a necked down .44 mag case and the spare cylinder was reamed for it. The original had good ballistics but had a nasty habit of backing up and locking the cylinder up
There was a redo called the Dreadnaught that had a sharper shoulder to reduce that problem and it worked OK ( I have the specs). But then the .357 Maximum came out and they both failed togeather.
I don’t have either, but the .357 SIG seems to be the modern version. I want the Dreadnaught, and keep looking for the .357/9mm Black Hawk and the time to play...