Rather than a bronze brush I prefer to wrap fine steel wool around a cleaning jag - the same one you'd use to run a cleaning patch into the barrel. Yes, it'll be a tight fit, but then, you want it to be. Just run it up and down the barrel about a hundred strokes; you'll probably have to change the steel wool a couple of times.
Most any rust remover will do the job; I use Blue Wonder, but there are several.
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