I will make the same argument here that I made about M-3s getting hit by tanks and not dying
every single time. Not my "dud" theory

.
Essentially what you want is a kill every time a 30mm hits, anywhere. I'd be willing to bet that, in real life, you wouldn't necessarily get a kill
every time. It would be a very likely possibility but a statistical impossibility.
The Mossie picture also brings up an interesting scenario as I was recently reading an account of a ME262 vs a recon Mosquito. The Mosquito was
hit four times and still managed to make it back to Italy and land.
Now, take the total amount of 30mm shells fired that hit and divide by the amount of them that kill the aircraft that they hit. What do you suppose that ratio would be? Greater than 50%? Greater than 90%?
This calls for a pie chart.
wrongway