I'm trying to identify revolver sizes of 22RFM single action revolvers whose cylinders/cylinder frame dimensions are near those of a Colt SAA. Ruger's Single Six models are about the only one I can think of that might be. But not owning one, I have no idea if it's slightly smaller or significantly smaller. And there are almost certainly other brands that might be.
The Lipsey's Bearcat I have is tiny compared with Colt SAA.