A good quality snub-nosed revolver is probably capable of shocking accuracy...from a machine rest...but what does that have to do with it?
We're talking about a personal defense arm that is assumed to be a last-ditch effort most often deployed at powder burning distances...or with the muzzle in actual contact with an attacker. It doesn't have to be very accurate.
Stressing over the accuracy of such a piece is like a discussion concerning the top speed of a pickup truck. Interesting...but irrelevant.
If your front porch collapses and kills more than three dogs...You just might be a redneck