bc, it's hard for me to imagine bronze scratching the steel of a quality rifle barrel. Bronze is considerably softer. I wonder if what you're seeing is traces of bronze scrubbed off onto the steel, sort of like what happens when a pencil lead is dragged across a piece of paper. I honestly don't know though and don't mind admitting it. All I know is what I've experienced over the years.

Roskoe, my 12 step program was actually a 2 step program, my 2 kids that is. I just got to a point, rather recently I might add, where I realized what my priorities should be and guns don't figure in as highly as they used to.