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Uhh, what exactly can you accurately hit at 320km?

With a smart payload capable of self-adjusting? Quite a lot.

Well, I didn't see/hear anything about what they were firing, so I assumed they were dumb bombs or shells.

Those launches look pretty violent, could a piece a with rocketry or electronic guiding systems survive a blast like that?

How about a "rail gun" for shooting things into orbit?

Not much would survive that sort of acceleration.

How is this news? I had a rail gun in UT

Navy tests E-M rail gun - will fire shells 9K kph, 320 km (video)