Aaaaaaaaaaaaaaahhhh, this never ending argument about something that just cant be solved by any means, other than having better ingame coded tracers..
Everyone agrees that what we see in real pictures, on real video or even on WW2 guncam is not reliable for all the technical blabla explanations that have been discussed in this thread....So how are we supposed to get a realistic graphic representation of what a real pilot would see in a real plane firing real tracers ?
It cant be done !
So we have two choices : ask a real WW2 fighter pilot to describe in detail what he saw 70 years ago when he fired his guns, or wait for some mods or Luthier to come up with a proposition that would satisfy most of us in terms of "what we feel is close to what we think that maybe would be realisticly accurate in RL"
Until then, keep on arguing if you wish, but you are all wasting your energy unless you put your brains at finding a way to show us how a damn tracer SHOULD look !

Salute !