I purchased a Remington Model Seven that was sold as a 300SAUM. It has a factory barrel that originally had iron sights (can see where the tapped holes were filled) and the barrel has been fluted (and in doing so the caliber designation must have been obliterated) and will NOT chamber a 300SAUM. The bolt is a SAUM boltface, and the best I can mic the muzzle is with my digital gauge is .270 so I think it may be a 7mmSAUM. what do I need to do to be absolutely sure? Cast the chamber with Cerrosafe?
