Originally Posted by
tdracer
Further, for air-to-air, mixing (relatively) slow cannon with higher speed 50 cal. would make leading the target for both nearly impossible.
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Many of the fighters had the different weapons boresighted to give a concentration of the different trajectory weapons at a certain range. This gave a reasonable sighting solution. Also, many of the cannon were giving high rates of fire that allowed their mixed use (most notably by German piston fighters) simply as a combined weapon. The use of very large slow firing guns was different, and they would usually be used to take individual aimed shots.
Cheers
OAP