It seems you wouldn't need a Model 70 specialist to determine if the rifle was worn-out or not. When you get it, remove the stock, check the metal that was hidden from view. Look at the stock for any damage. Reassemble. Cock the action, put the safety to middle position. Remove the bolt from the rifle. Push in the tab on the bolt shroud so that you can unwind and remove the innerds from the bolt body. Check over the firing pin and spring for unusual wear or rust. Put the bolt body back in to the action (without the firing pin assembly). Get a factory cartridge and chamber it. Notice any resistance when closing the bolt. A simple check for headspace is to then add thin pieces of sheet metal between the cartridge head and bolt face, then reclose, noticing how many thousandths are added before you encounter resistance. Basicly what you are doing is making a GO, NO-GO gauge. One thing you might want to check is the chamber- get a cartridge such as a 300 Weatherby and see if it will chamber. If it does, the H&H has been reamed to something else and is no longer an H&H. If after all this, your rifle appears to be as issued from the factory with no undue wear/damage and the headspace is within tolerance, then you can take it to a specialist for a closer examination and valuation.
