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Prototype Nazi multistage cannon ('V-3'), Occupied Poland, 1942
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Iraq was working on one as well though many years later
https://en.wikipedia.org/wiki/Project_Babylon
It seems like the idea was revived for modern railguns, except instead of chemical charges they're electrical.
Both have the same issue of excessive barrel wear. Main difference is rail guns use no explosives at all. It’s all kinetic energy. It’s insane how much of a punch they pack. My limited understanding is that’s why we have not put any in service. The go through barrels too quickly
True, the materials science just wasn’t good enough. The money was then diverted to hypersonic and laser weapons