A year or so ago, Walmart had some mismarked cans of the Foam. I bought several for around $4.95 each. I wish I had bought the entire carton! I have on hand, or at least used, almost everything on the market for bore cleaning.
It says "Hoppes Nitro Powder Solvent" on the bottle. It may remove a little copper, but doesn't have enough ammonia to remove it all. Hoppes lost it's sexy smell when they took out the Benzene. Sure it still smells nice, but it's not what it once was.
For copper removal, Sweet's 7.62 was the best. It REALLY works. Just don't leave it in the bore too long & keep it away from chrome.
Blue Wonder is a great surface rust remover. It wouldn't get out anything much better than Hoppes could.
M Pro7 works well, but the stuff seems to age rapidly & loses it's kick before I could finish up the bottle.
Then along comes the Foam. It does everything I expected it to. The wussy looking little 3 oz. can lasts quite a while, too.