Is it possible to scratch a Lee resizing die? I clean and polish my brass in to separate steps. Currently using a Lee 4 hole Turret press and noticed 3 large scratched on my 357mag brass. Took the Resizing die apart and noticed a small rough surface on the smooth surface of the die. Unable to get it off. I thought Lee dies were to last a lifetime? I put about 3500 round through the die so far. I think the dies are at least 2 years old. Any ideas?