Gonna make some noise this weekend, so will give it a try again, maybe on a couple different guns, and post results.
Tried it on 22-250 last time - Bronze-brushed bore with WD40, dry-patched out, then applied KG12 as per instructions. Scrubbed with soaked patches, also soaked bore and let sit. Didn't see much copper coming out, even after leaving overnight, so I dry-patched, then applied some CR-10. Got lots of blue, so finished cleaning with tried and true method.