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Richardc wrote: If you clean the copper out of the barrel

Does not compute...

most leading problems comes from not cleaning the barrel right.

OK but we're talking about shooting lead, not jacketed bullets. As I said, I know there are folks that have done it but I personally wouldn't because there are plenty of documented failures from it happening.

I've heard of people doing it to. However, if you do you need to limit the amount of rounds you do before you have to clean the barrel out. The lead has a tendency to build up while the copper from the jacket bullets don't present that kind of problem.

Yes it happens because the gun used was fired with jacketed rounds and not cleaned correctly before firing lead rounds. If polygonal rifling caused lead induced failures then lots of rifles with much higher chamber pressures in the 1800s(whose barrels were hammer forged with polygonal barrels, just not called that in the day)that had nothing other than lead rounds would have been blowing up left and right. show me a study that shows a NIB Glock that leaded a barrel right out of the box. Any failure due to lead exists between user and interface. That being said if you don't trust using lead, don't use lead. I have never had an issue, but any warning is a Good warning when it comes to firearm safety. I tend to error on the side of safety, even if my post seem to say other wise.