I have some interesting VV powders, and have been trying to determine the various burning rate factor, bulk density, solid density, etc. I've tried contacting Lapua already. Here is the question...if you take VV 20n29, what does the 20 mean, and then the 29? Any ideas because the burn rate is not 20...its 39 or 38 & I can't seem to find a correlation in the numbers! Thanks for any ifo!