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All of the ammonia-containing ones will remove copper from barrels - but will also remove your sinuses, LOL!
Shooter's Choice Copper, Montana Extreme, Butch's, Barnes CR-10, the brand new M-Pro7 Copper Remover, Hoppes Copper Solvent and several more will all do the job. But remember that we are talking about VERY small amounts of copper here. Using a bullet may not be a valid test as there is simply more copper there than a drop of solvent can dissolve.
I'd use all of these outdoors, because they can be VERY strong and possibly dangerous. Eye protection is also vital.
Also follow the instructions. A lot is not better than a little, and a long soak is not better for the gun than the recommended time. You CAN damage a bore with some of these chemicals.
Not to mention your sinuses!
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