<https://forums.sassnet.com/index.php?/topic/322814-cleaning-out-leading-with-a-copper-jacketed-round/#comment-4173084>
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"I would not do so. Not to clean it.\n \n\n\n\t \n \n\n\n\tIf you have a clean gun, a few rounds of mix and match should not hurt it. IMO.\n \n\n\n\t \n \n\n\n\tBut I've read running a jacketed round after a lead round can press lead into the barrel lands... Not sure I believe it, or why a jacketed round wouldn't press copper the same way into a steel barrel. But that would be one reason to not do this.\n \n\n\n\t \n \n\n\n\tOTOH, if the barrel is seriously lead-fouled, running a jacketed round through it can cause an over-pressure \"event\" with or without a squib.\n \n\n\n\t \n \n\n\n\tBut the shooters here don't seem to be the type to ever let a gun get that fouled.\n \n"
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