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Whilst looking for information on studies for 156" solid rockets applied to ICBMs, I came across this presentation on ATK's large motors. Buried in there is the notion of an ICBM using a 260" solid rocket motor for the first stage of an ICBM - no mention of what the second stage is, other than that it's solid. What really stands out is the throw weight of 110,000 pounds to 8,000 miles.