I don't understand why people have problems using brushes in their rifle bores. Stainless steel brushes should be avoided of course, but bronze or brass brushes aren't going to harm anything. I mean, you shoot bullets down the bore at thousands of feet per second under extreme pressure and heat and yet a bronze brush is somehow going to destroy it? Just look at the websites of various custom barrel makers like Shilen, Hart, Krieger or Pac-Nor and you'll see that they all advise using a brass or bronze brush to clean their barrels. I'm a little anal about it for sure, but I've never been able to clean a rifle barrel completely clean without the use of a wire brush.