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Cant seem to get the copper out of new Krieger barrel

I'm not saying JB is not helpful but be judicious in its use.

I was just discussing this situation with Casey of PacNor barrels. He said: "JB contains pumice. Applied long enough, and hard enough, JB will polish the bore out to almost a mirror finish. That kind of finish will actually grab copper like a mutha'. You don't want a mirror finish.

For copper, we use Holland's witches brew. It contains small amounts of aluminum oxide, which is what we use to lap barrels."

There is a product called Warthog. The makers claim is works better than Sweets on copper. I haven't tried it, but others have, with success.
Boss, second the Witches Brew
 
For years I worked with guns that
Shot solid copper bullets and if you didn't do it . Ten rounds and you had spend hours removeng copper. Majority of the problem was in the chambers . It's hard to send a gun that price was $40,000 plus back . JB and many strokes sure helped . Larry
Via Hawkeye, found that allowable round counts went up 10 X, bare vs properly moly-coated, using solid copper Barnes X. Never experienced any of the moly-related untoward effects often described, which I think based on personal experience are hysteria and old wives tales
 

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