Thank You all - you have been very generous with your time and information.
If I could turn back the clock and leave the rifle alone I would certainly do that but did have the bolt altered and a scope mounted all those years ago.
I still am not sure about ordering the barrel ( big disappointment about them coming white ). My main question is about the new .308 barrel bottoming up on the C ring - I have not found a supplier who states that their ' short chambered - lathe free " barrel will torque up properly. My fear is screwing in the new barrel and having it bottom on the receiver.