Sounds like it's barrel time to me. But not before a call to Remington. Larryi have a rem 700 now that wont close on a go gauge. My dies will just size the shoulder back enough if i set them to camover. im not going to just run a reamer in to deepen the chamber because the chamber is cut very crooked. So if I rechamber i need to bore the old chamber out concentric with the bore. The barrel tapers quickly so there is just barely enough room to do this. FYI