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I'm not sure a patch on a brush will exert enough pressure against the bore to really do the job.
Denton, you might try some stuff, the name of which I can't remember, that you dip your bullets in and it significantly reduces copper fouling. If I remember, I'll look on the shelf when I get home and report back here. Somebody else will probably know what I'm talking about. It's a purple liquid. You heat your bullets up to about 150 degrees (F) and dunk them. It doesn't change the appearance of the bullets (i.e. it isn't Moly). It seems to have reduced copper fouling in my 223 by quite a bit.
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