When i fly my 109, (im a "109 zen master" w/ my spud gun!) i like to make snap-shots at close range w/ MGs, so as not to waste cannon, and then, when i finally have the shot, i fire an aproximate 6 second burst of 30mm cannon. Or, if the opponent is far in front of me, i pop-shot. For instance, i was hunting an La-7, which was about 800 in front of me, and getting away. So, i pretty much stayed with him, and fired one cannon round at a time, a little high (to hit the tail-plane or canopy) one low (to hit the undercarage, and hope he crashes trying to land) one port (to get the port elevator stabalizer, port aileron, port wing) one starboard (starboard elevator, starboard aileron, starboard wing) and i just cycle through that, and as long as you stick with it, and he stays within 1000 meters/feet (ive never known whether its meters or feet on the display) and keep firing like that, eventually you hit the pilot, wing or engine, and they always die. As soon as someone levels out, they die. I suck at ACM, but im a pretty good shot, but the 30mm tater sure helps!