Gunner convergence is not elevated to the 500 yards. The sight lines and bore are parallel for gunners.
HiTech
I am not sure what you mean by that really. If I use a single gun, in a single plane (as per the film), is the gun sighted so that the shot falls through the line of sight at 500?
This is what I am reporting - that the gun shoots lower than the line of sight at 500. Depending on the calibre in use, I would expect that the "jump" differs for each gun, but that the point at which the bullet from each barrel in use drops back through the line of sight at 500.
I cannot for the life of me understand why you would choose any other way to do it. Are you suggesting that each and every gun is and should be, sighted/coded differently in elevation and then fixed so that every gun on every ship shoots with wide variance? Do I understand that you simply bore-sight and allow the characteristics of gun/ammunition to simply fly all over the place? It's quite a stretch to suggest that a fighter pilot should be able to tune his guns in elevation but that it simply doesn't matter for a bomber defensive position and its just "spray and pray" cos it's all too hard?
So when you say, "1st gunner convergence has never been 600 but it has always been 500 yards", then what exactly does that mean if it doesn't mean that gunner convergence is at 500 yards?