Because of the family history the rifle should be priceless to you. Otherwise, in reasonably good condition, the price tags I've seen on pre-war model 70's is a lot higher than a brand new model 70. I don't know what they actually will sell for, but at Portland gun shows I've seen some in the $3,000 - $5,000 price range. 30-'06 followed by 270 are the most common calibers, so they are worth the least. Still, yours could easily be worth a couple thousand. Be careful to keep it all original and unaltered. But use it; hunt with it; in honor of your great-uncle and the rest of the Family. In your old age, at an appropriate time, hand it down to the one in the Family that will best honor the tradition and keep it in the Family, not necessarily your own son, could also be a nephew. In some families there might be several grandkids that all got their first deer with Grandpa's gun. Stuff like that builds family cohesion and breaks down generation gaps. You have an artifact. Do not consider that you own it, but rather that you are the appointed custodian of that piece of family history. You will appoint the next custodian.