Well ,, after years of disgust and millions of rounds spent with few hits and less downed planes ,, hours of gun testing and filming ,and hours of forum hopping and reading, the answer was already mapped into the keyboard. Let's start with the bases of the gun sight,,it is bore sighted at 200 yards,, kinda short in my estimation,, I have found head move up and down effects the gun sight ,,, 1 click up in head movement adds 200 yards on the gunsight so you set convergance to 450 and 1 click up in head movement your rounds will land at 400 yards,where you aimed, tested and filmed,, with the help of Mr. Watson's Corsairs and kicking up the sight range,, I'm the terror of the south pacific,, and now I'm getting the shots I remember getting in Microsofts Combat sim 2.