he read that you could send then back to S&W to have then for the new better cartridge fitted as the barrels were the same.
Howdy
I don't think S&W does that kind of thing anymore.
Regarding cleaning a Model 3, there are Model 3s and there are Model 3s.
It is quite simple to clean my New Model #3. Lifting the latch frees the cylinder to spin off the arbor, and it is simple to clean. Not the same as cleaning a Colt, but certainly not difficult.
Same with my Double Action 44s.
The Schofield takes a little bit more effort, the original half screw has been replaced and has to be completely removed to free the cylinder. But then it is easy.
The Russian is easy to remove the cylinder and clean, but getting the ratchet back correctly on this gun is always a real pain. I don't shoot it very much because of that.
Lastly, I learned quite a while ago that I don't have to remove every last molecule of fouling. BP fouling that gets saturated with oil will not cause any rust. Any fouling that is hidden in a niche or cranny will be coated with Ballistol, along with everything else, and the hidden fouling does not cause any rust.