Also depends on what you plan on shooting, like a 6BR setup for benchrest (1:14 twist) will not do well at 600 to 1000 yds (1:8 twist needed for the big bullets).
The bore scope will tell you the condition of the barrel (i.e., how old or abused it is), but I have seen bores that looked really really bad win matches too. Like Randy says, shoot it in the game you will be using it in and if it shoots, go for it, but count on replacing the barrel.
A used BR gun is worth what it is worth(scope, action, stock, trigger, bases, rings, smithing to true the action) less a new barrel, that is it, no more IMO, unless it is a proven current winner or has a history and you are willing to pay for that history LOL