I cannot answer your question either, because I too only have old Uberti's . My 1875 "Outlaw" is in .45 Colt, and it too has a drag mark all the way around the cylinder, but it was from the bolt spring breaking and jamming the cylinder, so that when I tried to cycle it, I myself did the damage. Also, if you don't bring the action into the half cock notch before you rotate the cylinder, you'll scratch it. My brother does this, and it drives my nuts...he simply brings the hammer out of the frame but not all the way to the half cock notch, and then rotates the cylinder with his hand. The bolt drags on the cylinder.
I bought mine new in 1975 for $275 CDN. I have fourteen notches in the grip from 1st place matches I have won with it, in fact, I have only lost one I've entered, and it was to my brother using my Ruger Blackhawk Bisley in .45 Colt...my ammo!! I love my revolver. I replaced the front sight which was no where near as tall as the one you illustrated. I made mine to resemble a Colt front sight, and filed it thin to match the narrow rear sight 'notch". My revolver is a tack driver, and many times, I have shot the centre out of an ace playing card at 25 yards. Mine likes 30 graqins of FFFg GOEX and a RNFP 255 grain bullet.
Hope you ;too enjoy your new revolver.