<https://forums.sassnet.com/index.php?/topic/322814-cleaning-out-leading-with-a-copper-jacketed-round/#comment-4173516>
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"Copper chore boy strands wrapped on a brush will get lead out. Make sure it's  copper. While it's been my experience when shooting real black powder with bullets that hold a lot of soft bp lube that I  don't  get leading that's not the same as those loads cleaning out a barrel that is already leaded. \n \n"
<https://forums.sassnet.com/index.php?/topic/322814-cleaning-out-leading-with-a-copper-jacketed-round/&tab=comments#comment-4173880>