...and if you're a long range shooter, or you just want to know more about the science of shooting, you need it as well:
Brian Litz is the chief ballistician for Berger Bullets; the number one bullet manufacturer for shooters looking for long range bullets. He knows that which of he speaks.
well and then there's all this too:
"About the Author
Bryan Litz earned his Aerospace Engineering degree from the Pennsylvania State University in 2002. For the next 6 years, he worked for the US Air Force on air-to-air missile design, modeling and simulation. In 2008, Bryan became the Chief Ballistician for Berger bullets.
Bryan is also a very active and successful shooter. Some significant accomplishments include: US National Palma Champion (2008), firing member of the winning 2008 US Team in the Spirit of America International Rifle Match, and National Record Holder for the NRA iron sight midrange course (450-39X)."
You can order the book from him here: http://www.appliedballisticsllc.com/index_files/Book.htm
Even if you have no interest in the theory, Brian has done something invaluable for the shooting world. He has done real world testing on hundreds of different bullets under different conditions and velocities; and analyzed, tabulated, and published the results in this book.
If you want to know what your bullets are REALLY doing (vs. what their manufacturers claim they might be doing) you need this book.