Daniel, good question as to the unit for cast density. In the explosives manuals I have at hand, it's simply given as a dimensionless number, but it probably is weight per volume. Since my main reference is a 1984 U.S. Army document, there's a mixture of English and SI units throughout.
I will be at a course much of today, but will try to find the unit -- will spend a few minutes over coffee, and then search later and also ask some people. Unfortunately, the person who would know best is in Afghanistan and a little hard to reach. Howard C. Berkowitz 11:33, 1 May 2010 (UTC)