in a bb gun, steel or copper coated bb's?I know bb's will damage a rifled barrel,but do the steel bb's damage the rifled barrel more than copper? I have tons of copper bb's and they seem to be leaving a coating in the bottle. I imagine this will also get in the barrel. I only shoot bb's out of a couple of pistols, my Red Ryder, and my old 66 Powermaster. What about accuracy? Just curious.