Blackhorn 209 shoots excellent out of the Genesis. No breech fouling, excellent power, and easy to clean.
Sometimes it seems that gray will just not go away. JB Bore Paste is a good cleaner. That gray you see might be from all the cleaners and such also. Have you tried a water bath?
Get some of the JB Bore Paste, put that on the scotch brite. That will not remove metal. And then start working the bore with the Scotch Brite and the Bore paste. After that you really need to solvent patch clean that barrel real good. And then get a good coat of oil in it.
Also as you shoot it, that gray will go away. I have a badly pitted rifle that was given to me and while it drives me crazy, I still get a gray patch out of it. But it is a good shooter.
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