There is no best and many good ones. Then too there are how to books and data books. IMHO it's nice to start with Naramore and Sharpe for a fairly complete look how to including a historical perspective. It's a good idea to find a data manual that uses the components including bullet that will be loaded. Often since people tend to have their rifles and their game in mind choosing first a bullet of choice then buying a data manual associated with that bullet is a good way to start. If the first manual leads to a choice of a particular powder then follow up with a powder maker's data book and then a few more.
