Most of the guns I have owned over the past 40 years were/are antiques. I discovered that factory loads, and most of my handloads, left quite a bit of residue in the bores and chambers. I just figured that, in order to keep pressures down to original specs, the smokeless powders developed left residue. It is a simple way to look at it, but it seems to be true in my experience.
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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