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Apparently the largest atmospheric test done in Nevada was 74kT (https://en.wikipedia.org/wiki/Plumbbob_Hood)

It's kinda hard to imagine why on earth you'd ever build a warhead larger than 100kT. At that point it's just destruction for the sake of destruction, not to win a war, but to ensure that everyone loses... Well, that is the point of MAD, but it just seems reckless and inhuman.

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A reason, at least for a period of time, was accuracy of the delivery systems. You can’t attack a hardened target with a 100kt weapon and a delivery system with a 1km CEP, for example.

Not the only reason of course.

Standard current US ICBM is 800kt I think. They found the sweet spot. Biggest one ever tested was 50MT

300kt.

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