If you are the original owner I would send the gun back to Ruger. They screwed up, let them fix it.
I was in a similar situation when I bought an H&R 999 .22 revolver. The problem was H&R is no longer in business so I could not send it back to them.
I have had plenty of so called gunsmiths ruin guns I took to them for repair so I decided to fix it myself.
My chambers were rough so I bought a blue plastic chamber brush made by Iosso which is very, stiff, far stiffer than a bronze brush.
I took a short piece of a cleaning rod and screwed the Iosso brush on and lubed it with J.B. Bore Cleaner.
I put the cleaning rod in a drill motor on low speed and ran the brush in and out of the 9 cylinder holes about eight times each.
On two cylinders' I could still see a deep scratch but all the other scratches were now gone and all the other cylinders were minus the roughness that they had.
I did not get carried away and make the cylinder holes egg shaped. I just polished enough to get out the roughness. The result was I was able to use 7 different types of ammo and the empty cases actually fell out of the cylinder after they were ejected. Accuracy was not affected.
