Repeatedly, in EW and MW a single 20mm cannon round takes off a wing. Spitfires, Zeros, F4F's, F4U's, all planes are vulnerable. On the other end of the spectrum, 50 cals take a 1/2 second burst (about 20 rounds) to take off a wing. I have plenty of film.
Either change the eny for cannon equipped planes, or lower the lethality of cannons. Six 50's can't compare to a single cannon, and that's just wrong.
Regards,
Malta