What i do. Is use a small rag. Cut to size. And soak it in Kroil. (You can use your preferred bore cleaner). And put it in the bore. Let it sit for awhile. Then i use brass pipe screens and put it on a jag. And push it through the bore. If the fit is not tight enough a small thin patch under the screen helps. This set up i got the idea from the Lewis lead removers. It works better than using copper wool. You can see the lead on the screen. And the screens you can get in bulk from smoke supplies shops. Hope this can help someone.