That's the same one I have, it is rock solid if somewhat bulky. But it's great for a no gunsmithing mount. I recall that I've had it on Blackhawks in .41 Magnum, a .45 Colt and .44 Magnum (SBH) and it works prefectly. Probably had it on a couple of others I'm forgetting.
Can't recall that it scratched the finish on the barrel where that clamp goes. It's not really a clamp, just a semi-circular ring that slides easily onto the barrel. A big screw comes into it through the top of the mount and pulls it up into hard contact with the barrel - the screw doesn't touch the barrel at all. If the mount was scratching one could polish the very inside bottom edges of that ring a bit, that's the only place it contacts the barrel hard. You could even add a piece of paper or something to protect the finish if you wanted.
I don't shoot scoped handguns much except when I want to work up loads so this is invaluable for swapping scopes from one to the other. I'm not planning on selling mine anytime in the future.