Okay...not really. I've been shooting my heym 470NE with the Nosler Solids that "appear" to be brass monometal or an alloy that looks much more like brass than copper. After shooting TEN rounds through the gun, the rifling looks gold plated. After an hour of using wipeout foam, then a brush with a patch around it coated in kroil and JB Paste...guess what? There is still brass in the rifling near the muzzle. Is this a problem? Do I need to go after it aggressively? Am I using the wrong chemicals to clean my bore? After 1.5-2 hours on cleaning, its still not perfect. Crazy.