Depends on condition ... They're def not pre-64's when it comes to prices. I got a 300 WM at a local gun store with good bluing and a nice bore but a stock who's finish was flaking for $250 ~ $275 with an old tasco on it. This was about 4 or 5 years ago. Makes it about $300 in today's money.
The stock wasn't so horrible that I didn't want to shoot it or carry it, but I'm sure they gave the guy that traded it in $100 or something obscenely low like that because of it. I eventually refinished it and used it as a project & let my kid watch me strip it & help raise some dents & then refinish it & put it all back together.
They never had a reputation of being super accurate, but all the model 70's I've had - I've never had a problem getting them to at least shoot 1" groups at 100 yards ... wish i could say the same with a certain 700 that's sitting at the back of my safe. Anyway - I'm off topic ... A quick look at gun broker & I'm seeing a few like you describe selling for around $350 and a few where the auctions ended & didn't even get a bid for that price ... Those were for 30-'06's which seem to be more plentiful so I'm sure that's pulling their value down a bit, but it's not like the 270 is super rare either. If it was me - I wouldn't offer more than $400 and that's for a good friend.