Cartridges to chamber a minigun into

W80

200 rounds of 800mm shells fired and impacting within 20 seconds will be enough to destroy any military or civillian target you want to eradicate. If you really want to go all out you can add GPS to the shells, as well as steering fins for final approach.
Also: a single gustaf shell weight 7.1 tons. The total payload of a minuteman missile is less than 1.5 tons.
You could launch multiple reentry vehicles, each with multiple thermo nuclear warheads in a single shell, and then fire 200 rounds within 20 seconds.

40mm CTA.

I've been thinking about that, and making rotating chambers for the gun would be quite easy. The problem is that they can't be connected to the barrels, because they are push-through type chambers. So you'd have to have the barrels and chambers rotate independently, and synchronize them so that the pushed out cartridges don't hit the barrels. I think the best solution would be reducing the number of barrels and chambers to 3, and rotating the chambers and barrels the opposite direction.

The AP shells were 7100kg in total, if we used modern production (and propellant) to build 80cm shells then that could mean a payload of at least a few tons of incendiary or WP. A ten barrel rotary array firing these things at a total rate of 2000 rpm would give you a 1 minute burst before you needed to cease-fire and reline the barrels. A few thousand tons of WP distributed over a few dozen square kilometres would be enough to wipe out cities, or even smallish islands, without the long term medical and environmental risks of using nuclear warheads, with potentially limited damage to the infrastructure and buildings in the target area (you'd probably want to get a few engineers to check over things before you used them again though). I imagine the political fallout would be at least as bad as it would be if you used nukes though. I imagine the traditional excuse for firing WP at people ("Just a badly aimed smokescreen, we're sorry") would ring a little hollow here. It's going to be outrageously expensive, but for wiping out all potential resistance in a target area I imagine that the cost would be manageable compared to comparable solutions (a few years of occupation and counterinsurgency work for i.e)

Now I know what you're thinking, and it is an obvious question, but how are we going to get this thing into orbit and counteract the unwanted acceleration that much recoil would cause?

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I'm sorry, but did your plan not include engraving our world's history all along the device and having it's salvo propel it to the farthest stars to impress upon alien civilizations just how hard they shouldn't fuck with us?

Put the gun on the end of a moment arm, fire in short bursts. When the moment arm comes around 180 degrees an identical cannon, mounted on the other end pointing in the opposite direction, fires a burst precisely twice as long as the first one, which cancels the first recoil impulse but adds just enough to get the contraption rotating again. When it rotates 180 degrees in the other direction the cycle repeats.

Damn, remind me to rewrite my first contact plans.

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Eh, rushposting is nothing new.