I believe it can and has been done by one of the custom gunsmiths (Bowen, Clements?). Ask Lloyd Small, (single action forum) he has mentioned this before. I believe they will do .32 on a bearcat and 38 on a single six. BUT, It would be VERY expensive. And since Ruger makes the great Single Six Vaquero in .32 with a short barrel, I could not justify the price. If you want it more compact, and lighter than that, pick up a S&W lightwt "J" frame. 44 Man