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Not good in summary
I think 20mm generally is fairly limited against anything armoured unless it's an AP round, and generally aircraft would not carry those, ball at best. 20mm HE would give better effects against soft targets like trucks but would still need a direct or very close hit.I was wondering that as well, but came to the conclusion that as it is an American report, was probably a 50 cal weapon.
The advantages of the heavier weaponary was a higher kill probability against AFVs. The disadvantages are less ammo, lower MV, and lower rof. A 20 mm weapon late in the war would struggle to bring down a heavy tank, even when hitting the target through the decking plates, the tanks most vulnerable defences. Generally kill claims to 20mm cannon armed a/c have been proven untrue, even 40mm armed a/c struggled.