Some photos would be nice. Your inquiry is akin to the old question, 'How long is a piece of string?" From the few facts you have given, however, if you can buy the gun at that price, it sounds like a good value. The big target guns bring some prices comparable to their heft, and for example, I have a similar piece that I wouldn't sell for twice the amount you have cited.
At least give us barrel length, stock wood, extras such as inlays, etc., and equipment still with the gun. Barring photos, that will help.
Best-Dick