Re: head space or bolt face
You could have it re-crowned, that nick probably isn't helping anything, or you could have it re-barreled. A 270 Win will fit with no bolt face alterations. You can do a 7mm Mag but the bolt face will need to be opened up to a mag and a sako extractor installed. If your going to install a new barrel that's the time to have the action blueprinted. I don't know who your gunsmith is in MN but if your comfortable with his work than by all means that who I'd use.