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I use bronze wire brushes...all the time on my barrels..../ after every range trip ( usually 200 rds or so ) ....to get the jacketed plating out of the grooves in the barrel...
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While bronze brushes are softer than the barrel metal, a lot of use of wire brushes WILL begin to wear the barrel -- just like you can use sticks to rub a groove in concrete or marble or granite. It takes a while, but it WILL happen.