Speaking of polishing, thanks to Ruger's QC in the 21st century I had to polish the chambers in my Bearcat and Single Six. I probably should have sent both guns to Ruger, but I'm stubborn and it was a learning experience.
My method was rather gentle. I took a metal slotted tip (for .22s) that is meant to attach to a cleaning rod, and chucked that tip into one of my variable speed power handheld power drill. Then I'd put a cloth cleaning patch (t-shirt type) into the slotted tip and folded it over and around the tip to fully cover the metal. I poured on a bit of Mother's wheel polish on the patch, then insert that patched slotted tip into a chamber and start up the drill.
It's important to let the polish go from wet to dry, otherwise it really won't polish. Friction from the patch spinning will get the cylinder quite warm. Checking the patch is important, as once it gets overly dirty/browned, it needs to be changed out. This is not a fast procedure as you will need to run through several patches per chamber, and you may have to do it all again once you do some test firing. But the end result is much easier ejecting empty cases, about like you'd expect in a centerfire revolver.
Here's an old pic I've shown many times of my Single Six's magnum cylinder. The chambers were originally as rough as the centerpin hole.
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