Never said it was projectile diameter that did the damage.
The United States did attempt to move into cannons, but had lots of troubles developing ones that would work.
Early on the Lockheed Lightning was even developed around a 23mm Madsen cannon that proved to be an enormous POS.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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