I have, many years past, read that Colt experimented with a revolver in .25-20, and there may have been a very few special order Single Action Army revolvers in this caliber. I have never seen any reference that I recall to S&W ever doing anything with the cartridge.
Let's clear one thing up. The .25-20, .32-20, .38-40 and .44-40 and earlier W.C.F. designations of the same cartridges are, and always have been, RIFLE cartridges in spite of the fact that soon after their original introduction (.32-20 and .44-40) in the Model 1873 Winchester and later the .38-40 and .25-20 Colt and other manufacturers adapted their revolvers to use the Winchester Rifle cartridges. Any reference to any of these cartridges in a rifle as "Pistol Caliber" is totally erroneous.