I'd go on Armslist and see what they are going for. My guess, going off 30-06s, is $450-650, depending on who is asking. Speaking from my bowels, around $500. Anything used, is what a person will pay, and how long you want to sit on it.
I was looking at that era 700 n 30-06 around $400 couple weeks ago. Was temped for a project. Nothing wrong with it.
7mm mag might be more thant 30-06, since they are so common around here.