Butches is an execlent product. Question are you using a brass brush or a nylon, Butches is a solevent that removes cu from your barrel, so it eats brass brushes also. I don't know how this would work on a blue barrel but if you remove the barrel from the stock (it will eat the stock) and use carb cleaner, it will take it all out or at least it's worked for me a time or 2 in the past