Hunting guns get more tear than wear. By this I mean that the outside finish will have suffered from handling, falls, drops, dings and all types of branches hitting and rubbing against the stock. There is almost no chance of wearing a hunting gun out by shooting game. Now if it has been used as a clay target gun that might be a different issue. But how many doubles have you seen on the clay target range by a shooter that was serious about competing or winning? They all have K, B, P, or Kolar guns.
A used double that has only cosmetic problems can be one of the best values. I like pre war German guild guns, Webley 700's, BSA's or some of the guns that were made in Japan in the 60-70's. Many or all will be in your price range if they have cosmetic issues. And for a shooter they are the perfect thing in my book. A solid gun that you do not have to baby and can even shoot in the worst weather.