Yak-9T - incredible firepower (or maybe incredible tank's lack of armor?)

[swiss]

Originally Posted by majorfailure

But we are talking about effects aircraft bullets can do to tanks, not tank vs. tank gunnery.

Not sure I understand what you want.
Anything smaller than 20mm cannot penetrate tanks, 37mm can, and the latter is everything but small caliber.

Btw: iirec Rudel mentioned setting some T34 on fire with 20mm guns, but only because of the tanks external fuel tank.