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Old March 11, 2019, 12:06 PM   #39
Join Date: March 4, 2005
Location: Ohio
Posts: 18,297
The problem with #1 is the greatest friction occurs between two metal surfaces when they are the same metal. So you get a trace of lead on a barrel and then it grabs more lead, etc, if you don't have some other mechanism preventing that from occurring. However, if the lead sticks to the barrel marginally, it appears that allows gas expulsion to erode it as fast as it tries to build up. I have a number of 45 Auto barrels that never have more than a trace of lead build up around the throat area. That holds true even if I shoot bare cast bullets in them with no lube at all. The thing they have in common is they are all very smooth and have toolmarks only in the taper of the throat.

If the article I linked to is correct, though, you can't smooth the nitrided Glock bore enough to get there.
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