It is somewhat normal Mike. I use a little bit of Chore Boy copper scouring pad to scrub it right off. Most likely it was a tiny bit of lead mixed in with a good bit of bullet lube, just enough lead to make it look grey. I'll bet next time you shoot it the ring will come off with your fingernail, then you will know it is mostly bullet lube.
Take a worn out bore brush and wrap it with some of the Chore Boy pad, it will take the leading out of the barrel better than anything you have ever used.
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