I think the greatest problem with the 152mm gun is it was just too damn big! The amount of propellant required to push a 152mm projectile is always going to cause problems with a small, light vehicle such as the Sheridan was designed to be.
If they'd stuck with around 100mm they might have avoided some of those problems with recoil, however that (obviously) requires a reduction in warhead diameter and coresponding reduction in penetration performance.
Overall though, it was a system too far ahead of it's time - great in concept, but the technology of the day just wasn't up to scratch.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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