I have nose mounted cannon and m/c at 1000m e.g. Bf109s
wing mounted cannon at 500m e.g Spits
wing mounted m/c at 300m e.g hurricanes
If I have nose and wing cannon e.g. FW 190 I set to 500m but some recommend 600 or 700m
If you set the nose guns lower the trajectory falls low- the longer range gives flatter trajectory.
The wing guns settings are closer as they fire in a x pattern so need closer to ensure more hits
The m/c guns closer still to make up for lack of firepower.
200m is ok offline for fighters but youll probable get shot down a lot with sniper bomber gunners if you are getting that close so increasing it might help.
Online there is always slight packet loss so the plane you are targeting isnt quite where you see it.- give it that 1/4 ring extra lead also helps me
here are two helpful articles
http://www.airwarfare.com/tactics/tactics_fwgunnery.htm
and here is my article and practice missions
http://www.airwarfare.com/guides/snapshot.htm
hope this helps
p.s if you ever work out how to hit with 30mm cannons please let me know :oops: the slow rate of fire and lobbed flight path means I cant hit anything with these