Unertle man

Hi, I am looking for a gunsmith who can polish a chamber burr out. I have a nice 91/30 that shoots really well but the chamber has a burr....the burr cuts a crease into my casings and trashes the brass. I had one gunsmith reduce it with emory cloth (sp?) ...but not enough. The rifle shoots too well to simply scrap!!! I am in the pacific northwest... Ben