I saw one many years ago in a gun shop and I had no idea what a 30 Carbine round even was.
Intrigued, I went back to the store a couple days later and found a box in the ammo shelves -
I looked at the size of that cartridge and decided I want the revolver ...
It was already sold and I never saw another Ruger Blackhawk, 30 Carbine, SA Revolver again.
(I Later found a nice M1 Carbine, though.)
If you didn't grow up shooting a carbine, thats abuse in my book!