Monte, the reason it didn't work for me was that the nozzle has to be placed firmly against the crown of the barrel of else the foam sprays all over the place. In the 22 cal, it does not want to go down the barrel (under pressure, expanding foam) too easily. With a muzzle break, you can not get the nozzle against the crown. Tried the little tube extension and just ended up with a mess.
It does work on light copper fouling but with "rougher" barrels, it just takes so many applications that it becomes very slow. Quicker just to swab or brush with CR10 or with strong ammonia and be done.
Tried it enough to know it didn't work for me. Not saying it is not a good product. Just not the one I would recommend for non match (smooth, low copper fouling) barrels.
I also don't use Butch's Bore shine for similar reasons. Many bench shooters swear by it. I found that after it "cleaned" my bore, I could use Barnes CR10 and clean out a whole bunch more copper fouling. I shoot a lot of production and military rifles.
Good luck...
Jerry