I have a Remington 700 that when feeding from the magazine scratches the brass cases and bullet. The feed ramp looks okay but not sure what else could be causing this. It is a brand new rifle shot less than 200 rounds. If I do not load the rounds in the magazine then it functions fine without damaging the cases. These are not light scratches but fairly deep. Any help with this would be greatly appreciated. If it is the feed lips what's the best way to go about polishing them or sending them, are there any videos out there showing this?