Quote:
Originally Posted by borithan
The only time I have heard of WW2 40mm cannon being used against tanks (on a ground mount) was during the Pacific War, where early in the Burma battles the British used them against the Japanese. From what I remember to little effect, and this is against Japanese shitboxes. While it will be partly down to ammunition type, and the British did have a weird obsession with specialising their guns and sticking to it, but it can't have been the only reason surely?
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...you should maybe note that the British 2 pdr tank gun is 40mm. And of course there was the American 37mm. Neither compare favorably to later, larger caliber high velocity guns, of course, but both worked quite well against early-war tanks.
Of course if they were using anti-aircraft HE shells rather than some flavor of AP, you should expect them to have terrible results even against downright terrible tanks.