There seems to be more than casual interest in this theory, so I'd ask a Moderator to "stick" this thread to the Factory Ammo and Reloading.
 
The original work on the matter (OBT) was conducted by Chris Long. You can read his paper here: http://www.the-long-family.com/OBT_paper.htm
 
The web-site that discusses OBT the most as well as the Optimal Charge Weight technique is: http://practicalrifler.6.forumer.com/index.php
 
Please do not consider this post as an endorsement of the Practical Riflery site. The site is among the best for technical review of target riflery. The site owner (Dan Newberry), and a couple of other folks have useful insights into the practical application of OCW and OBT.

Here is another URL that will get you right to the OCW and related topics without having to visit the forum.

http://optimalchargeweight.embarqspace.com/
 
Paul