I Have a 460 that I have had for sometime. It has not been shot much. About 10 factory. and 150 lead. I deceides to clean it. Bore was heavy coppered .I am going to run some lapping bullets through it on low end loads. The other Interesting thing. The comp for cast lead. Wow there was about 1/2 of bullet of melted lead in it. I cast and found that Kroil works good on molds so I soaked the comp in it for about 3 hours. Most all the lead brushed out. I would say an over night soak would take it all out
