Bore Tech Eliminator, go by the instructions, and you'll see that copper disappear.
It really has no smell and can be left in bore overnight but they say keep it out of the rest of the rifle
anyway it works real nice and I tried numerous products, because I saw the very same thing you fellas did, and by the way in the scheme of things, it isn't totally necessary to remove all the copper, nor worry about build up until accuracy starts to go then deal with it.
