Well, I gave it another try....
First, I cleaned with Hoppes, until the powder fouling was all gone, then ran two dry patches.
Following the instuctions for the KG12, I soaked a patch (#1 in pic) and ran it slowly the entire length of the bore for 20 strokes (actually 21, to exit the muzzle). It had dark residue,
presumably copper, on it.
Did the same thing with patches 2 - 4, with less color showing each time, as the pics show. With the #4 patch being clean, I presumed that the copper fouling had been removed, so dry-patched the bore twice.
Then, to check for copper, I ran a patch with CR10, giving 10 (actually 11) full-bore passes. As the pic shows, there was clearly copper present in the bore. It took several more patches than the successive ones shown to remove it all.
In my opinion, while this product may work in some military applications, as they claim, it doesn't seem to work very good on my varmint rifle.
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