So I've been shooting for a powder coated Blue color 180 grain wheel weight casted bullets in my 40 Smith & Wesson about 300 rounds, approximately 950 fps, went to clean it and there was excessive black residue in the barrel grooves that took a lot of effort to get rid of no lead but I was shocked at how much this black hard so it was stuck to the inside of the barrel anybody else experience that maybe I'm not heating enough temperature I don't know