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"Well if you're going nuke, and eating the huge costs to build a handful of BBs, then why not go all out & use railguns? They provide far more range (and velocity) potential than conventional "gas expansion" propulsion methods, and you don't have to deal with dangerous propellants."
Rail guns are about 20 years from reality IMO.
Scramshells will be ready much sooner, and provide a tremendous capability in their own right.
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