Couple questions about fouling in a friends rifle I'm trying to make shoot: I've found Over the years that stainless barrels are a lot easier to clean and defoul than moly. But this one (25+ year old Douglas moly) is giving me fits. I've used alternating treatments of copper remover and powder solvent thinking there're layers of copper and hard powder built up. The patches following the copper treatments keep coming out blue, not getting any better. I finally used Witches Brew and the patch came out totally black. So my question is do I have more hard powder than copper in the bore and does anyone have any recommendations on better cleaning products? I can still see traces blue Oxidized copper in the corners of the grooves.