GM, that is a cool pamphlet you've got there.
These rifles I did, (three of em) were my high powered 22's that I've been shooting varmints with. I've been reading some on the bench rest forums and these guys go nuts over copper fouling.
I think the stuff I used is less potent than a full bore ammonia soak, and it did seem to work pretty well. Seems to be water based, and really cut the powder/carbon crap first. Then with a little more scrubbing with a brush, seemed to dissolve the copper, leaving the rifling smoother, and undeniably clean. I actually think it would be great for a corrosive clean-up.
If these rifles shoot as well, or even better than before, I'll probably just do it more often, without making such a big thing of it. I'll let ya know after the next target session. jd