What's your version of "clean"?
If you're trying to get every speck of copper fouling out of your barrel I think you're wasting your time.
IMHO, a little bit of copper fouling is good to have in a barrel. I think you may be taking it to extreme on your cleaning. My rifles sometime shoot worse initially after cleaning. Once I send a few down the barrel, my patterns settle in. If this happens, it tells me that I spent too much time getting it "clean".
It's one thing to have build up, but another to have your bore completely free of any copper/lead. No matter how much you clean, cleaning agents will pull fouling out of the rifling/lands in subesquent sessions.
That's my take on the issue anyway.
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