Depends a lot on condition (overall) and grade of the wood, there's not much of a collector market (outside of specific models/grades) as its the most prevalent bolt action Rifle made in the US. As info new 700's range from $389-1500+ depending on configuration.

If you can, post some pics of it and I and many others here can give you a pretty solid idea.

If its in good condition, standard run of the mill wood, I'd say around the $400-600 range, that's obviously a fairly wide band and is completely dependent on condition and configuration, could be higher, could be lower.