Most tank armour was quite thin at the beginning of World War II.

As a result, most countries considered anti-tank guns with calibres of 2 inches or less to be sufficient.

The 37 millimeter was used by the US and Germans, the 2 pounder by the British and the 45 millimeter by the Russians.

The tanks swiftly developed armour that was impervious to these small rounds.

As the war progressed, all powers advanced through a series of conventional antitank guns. The United States went from 37 to 57 millimeter. The Germans adopted the 50 millimeter, whereas the British adopted the 6 pounder which is likewise roughly 57 millimeter.

On medium tanks, guns with a calibre of 75 millimeter or 3 inch became the norm.

The 3 inch was chosen, because all forces had competent A.T weapons in the 75–76 millimeter, or 3 inch calibre range, and they provided sufficient power with the lightest gun and ammunition.

Music Credits: All This Kevin MacLeod (incompetech.com)
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