[supercat]

If they're going to build an inert projectile -- which is what a JDAM without an explosive warhead is, basically a really huge, really smart bullet rather than a bomb -- I'm surprised they couldn't find something more dense than portland cement.

Is it possible that the cement was chosen because the resulting mass and CG are comparable to those for which the guidance systems were designed?

[ReignOfError]

Is it possible that the cement was chosen because the resulting mass and CG are comparable to those for which the guidance systems were designed?

Possible. Probable, even. If I could calculate that telemetry in my head, I'd be sitting in much more expensive digs then I am.