So I came across this book from an engineering professor friend of mine and since he knew I have a huge interest in the study of ballistics and firearm/shooting theory he forwarded me the link to this book. From my understanding this is a high level engineering and physics book and its not cheap either at $170! BUT if you want to explore the higher level theory behind what we are all trying to do then this might be worth it. I just thought I would add this so that those who want to take their knowledge to the next level could have a book to help them. I don't get paid or anything from these guys I just thought it was a good addition to the site. Ballistics - CRC Press Book Good luck!