Reloading manuals are like guns, but thankfully cheaper. You can never have too many! I have the 6th edition Nosler book that I refer to a lot, as I load heavily with Nosler bullets. I have a Hornady book for the cheap bullets I plink with sometimes. I also have a Lyman 49th edition, and a older Speer book. Lyman is nice, in that they are not tied to any bullet or powder maker. As a result, you'll see a variety of brands of bullets and powders used. Speer will use Alliant powder and Speer bullets, Hornady will use Hornady bullets, and Nosler will use their bullets. Each has their place, depending on what you shoot mostly.