Rich,
Drone circle offline. This is an inefficient way to test it. But, you probably have the skill and patience. Put the planes you are concerned about really killing in the MA in the drone circle. Then get behind them 200-400 and try tapping out one burst at a time while on full zoom and watch the results of the ballistics visa the tracers and the amount of damage.
Put a B25H or B17 in there and count rounds while dismantling them part by part. Miss the cockpit on purpose.
In the end you will show yourself what you already know. In the MA get as close as you can, then load em up with 20mm until they die. Or tap out a few at a time and get lots of assists while feeling fortunate for a few kills.
Predator,
He was doing that based on the destruction ability of the rounds, ganging of four guns in the nose creating a shotgun effect, and the qualities of the delivery platform versus the competing platforms of that time period. Even for real world pilots the 262 was not a simple point and click solution like we want it to be in our cartoon world.
I've never considered asking Hitech if he used Tony's data for the guns in the game.