We used a device in the 105mm M68 gun as a sub-caliber device to help with crew training. It fired .22LR ammo from a rifle device mounted in the breechblock. As I recall, it fired tracer ammo and was woefully inadequate even for training purposes. There is no way a .22LR can be made to simulate a 105mm round.
But, when I was in college our ROTC department had a range and they shot a lot of .22LR ammo, teaching basic marksmanship to the cadets.
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