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Maybe.
The problem with really bad fouling is that it's composed of many, many alternating layers of powder and bullet jacket fouling. Take out the top layer of copper, and the layer of powder fouling underneath remains. Remove that and the copper layer under THAT remains. And so forth...
There are two ways to proceed. You can soak the bore with a solvent that's pretty good at removing both copper AND powder fouling, or you can attack each layer in turn with a product that's really good at that.
Of the dual-purpose solvents, the one that gets the highest praise by gunsmiths, benchrest shooters and others is Butch's Bore Shine. They say it's far superior to any other dual-use product. Next best might be Sweet's.
Plug the chamber and fill the bore with Butch's. Let it soak NO LONGER than the label directions say. Dump it and brush. Repeat if needed.
The layer-by-layer approach can be tried with a heavy-duty copper solvent like Barnes CR-10 or Sweet's. Plus a dedicated powder solvent like Shooter's Choice or a mild abrasive like JB Paste.
One final method is to use an electronic coper remover to "reverse plate" the copper onto a cleaning rod. The Outers system is great. But you may have to use it multiple times, getting at the protective powder fouling with solvents in between electronic treatments.
Final note: never dunk a brush into a bottle of solvent - the used gunk on the brush will "kill" your solvent. Drip it on, preferably from a small plastic dispenser. Also, if you use a copper solvent and bronze brushes, you'll see blue patches forever, because you are dissolving the brush INTO the bore.
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