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^ Shooting bullets through your barrel will wear it down quicker than a bronze brush will sir.
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Kind of depends on what you're shooting, how much you shoot, and how much you scrub, doesn't it?
Lead is pretty soft, so is copper. Bronze is mostly copper and a little tin and much harder than copper alone. If you're shooting copper-clad lead rounds, I think that makes the round shot a bit HARDER than lead alone, but softer than the bronze brush. Some folks may be shooting steel -- ala the cheap imported ammo -- and that's arguably much harder than a bronze brush.
Using bronze brushes CAN accelerate wear -- but if done judiciously, it probably won't matter much; done heavily and regularly, it could make a difference.