"i would,nt worry about how much metal is left under the base you could,nt blow the action up if you wanted to"

Safety is not an issue. I am simply curious about the size of the barrel shank. A small shank would indicate to me that the scope installation was factory original.

"BTW is the bolt numbered to this gun it looks odd at the shoulder "

The bolt is serial numbered to the rest of the rifle. No issue there.

Igorrock:

When I was growing up, it might have been possible to take a rifle in to our local clinic (no hospital available locally) and have it x-rayed. I recently had an x-ray done of my hip locally and the amount my insurance company was charged for it was astronomical. It would be far cheaper to have a gunsmith remove the barrel replace it. I'm not that curious about a rifle I don't plan to keep in any case.