Gentlemen, I happen to know 400 personally, and I concur with everyone here. If he tells you anything you doubt, where double rifles are concerned, go with him because he will be correct 100% of the time! He has total recall, and an almost photograpic memory. If he simply scans material he is intrested in, he will remember it verbatum. He deals in numbers for a liveing, and can spot a missplaced number as far as he can see it! I wish he would write a book, because it would be one we would all be buying in a heartbeat! Congratulations Mark!