I'm sure many of you are familiar with this website and Mr. Boatright, but I just stumbled on to it this morning. This is a very informative, if not a bit technical, read.
http://www.thewellguidedbullet.com/pdfs/TheWellGuidedBullet(PartI).pdf
http://www.thewellguidedbullet.com/pdfs/TheWellGuidedBullet(PartI).pdf