Fishu, I say it is your impression because you have not shown that you used any kind of rational scientific test method in the least. And the results you posted are not very precise.
You say you have shot at drones tens of times and it has taken 2-6 hits to get damage.
Where you airborne or was it a static test? (its almost impossible to do a controlled test airborne)
What distance were you when you shot the drones?
Was it the same for each gun type? And was it the exact same range each iteration of the test?
Was the target aircraft/drone the same type, each and every iteration?
How did you determine damage?
How did you determine the number of shells expended to accomplish the damage?
How did you determine the actual number of hits?
Each and every one of those variables are critical to the situation, and if you varied them by more than just the slightest bit, your results are not valid, because you are changing the test conditions.
You say that the Hanger tests are not valid, due to the type of target it is. Fine, I can accept that premise.
Then I would suggest you find a partner to test with and do it in the training arena. Pick one type of target aircraft, and then taxi the Shooting aircraft to a designated distance (preferably you would test at different distances say 100yards, 250yards, 500 yards, 750 yards, and 1000 yards). Plus you would have to insure in some manner that you were hitting only a single aircraft damage area, each and every time (like a outter wing panel). And then you would have to repeat the test process enough times to be statistically significant, I would say each test would have to be done a minimum of 25 times to remove error (more is better).
Then when you are done, you come back, post your method and your results (including the raw data). This allows others to repeat the tests and verify your results.
This is what is called the "Scientific Method". Ask anyone who has had engineering/scientific training and they will tell you its the only way to do it and get valid results. Ask funked, niklas, zigrat, or wells. They will tell you the same thing.
Yes its extremely time consuming and boring, but anything else is just an impression, because if you are not keeping the test conditions exactly the same from test to test, your introducing error into the results.
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Vermillion
**MOL**, Men of Leisure