the WW2 gunners by the tactics used here in AH. Here, all guns that bear on three planes shoot at the same target, and we typically get a nice slow closure rate from six o'clock.
In the real world, the fighters flew smarter, did slashing attacks, and not all gunners shot at the same plane. That's a lot more difficult.
Have you ever fired a .50 cal MG? I have, and the damned thing will teach you all about vibration, believe me. WW2 gunners had to fire in short bursts, since they could not keep the sights anywhere near the target for a long burst. Even turret mounted, electrically or hydraulically trained guns shook like crazy.