Keep in mind that the way that bombers are flown in the game is unrealistic, and the way in which most players engage them is much more effective. If used properly, a 20-30mm cannon could and should make short work of any WW2-era plane.
That said, it might be worth looking at the accuracy and effectiveness of heavy flak at high altitudes. By 1944, the number of U.S. heavy bombers lost to German heavy flak was very low (something ridiculous, like 1 plane lost per 1000 sorties), despite the Luftwaffe having some of the best AA gunners in the world, and huge numbers of heavy flak guns.
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