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black ring forming in barrel
I just bought an Benelli M1 and have since put 250 rounds through it. I have always been very good about cleaning the barrel of all of my guns after each use, but after using it this weekend, I noticed a black ring forming inside the barrel probably somewhere between 3-5 inches from the breech. I have tried using Hoppes 9 which has always worked well for me in the past, CLP, and even gasoline. None of which seem have had any affect although the rest of the barrel is exceptionally clean. On a previous post, someone recommended using a section of cleaning rod in a cordless drill with a bronze or tornado brush on the end. I tried both and niether worked. Does any body have any suggestions on what else I can do to remove it? I have never encountered such a build up on my 870 and did not expect it on a new barrel after only 250 rounds. Your advice it greatly appreciated.
Thank You
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