depending on the condition you may get more than 400. Ive seen them, depending on the condition, go for more.
if you join some of the gun auction/selling sites you can do a search for past/expired sales on guns.
Also, if my memory is still there, those older guns had the epoxy finish that had a tendency to chip/flake. If its blued, then i would pay more since i prefer blued guns. ITs just something "I" like and for those that dont or wont pay more, thats up to them.
If you are going or want to sell it you can just put it up on the auction block and start at 0. Or if you want to get back a minimum of $$, you can put a reserve on it.
If all you want to do is to know how much its worth, you will get in the ball park, but thats it. Its all speculation until you sell and get cash in hand. You can use the blue book or ? i use the gun auction/selling site since that is what people are buying/bidding for them, not a value (estimate) in a book that has no idea on whats hot or not right then and there.
All guns have been shot at the factory. Its what they do. So 100 or 1000 rounds isnt any difference to me. I will buy based on the gun and not the story.
here are 2 that are on GB, if this is what your look like and the box. i think 1 has been re-posed several times again, if my memory is good.
https://www.gunbroker.com/item/780097553https://www.gunbroker.com/item/780019856