<https://forums.sassnet.com/index.php?/topic/322814-cleaning-out-leading-with-a-copper-jacketed-round/#comment-4173400>
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"I've seen this, too.  But we must agree, carbon build-up on a cylinder face is not the same as barrel leading.  I'm still anxious to hear Garrison Joe explain the real, measurable, factual physics supporting his claim.  Not opinion or anecdotal BS.\n \n"
<https://forums.sassnet.com/index.php?/topic/322814-cleaning-out-leading-with-a-copper-jacketed-round/&tab=comments#comment-4173880>