I have one of these conversions, done by Mr Bowen.
Mine is a Model 15 frame, a Model 16-4 4" barrel and a k-22 cylinder that he bored to 32-20!
I really, really like it, shoots wonderfully, but wish it were a 32 H&R , only for
ease of reloading.
The brass that is, not the cylinder of the gun.32/20 cases being thin and bottlenecked, they put a crimp in my 99% straight walled pistol reloading.
if I like a gun I tend to shoot it a bit.
This gun is really nothing fancy, I had a fancy one of his that I traded for here on this forum, a Model 25-5 that he had rebored a model 29 cylinder for, so throats of cylinders were "perfect" he does very nice work, that gun had also been glass beaded and blued, sort of a beautiful "french gray" look, sort of like the Model 25-7 that I sold a while back....