This big fat book is chock full of load data, rifle lore, and common sense. I don't consult it every day, but every time I do, it's worthwhile. You will usually find useful load data (some of the load information is dated), but unlike in a typical reloading manual, you will almost always find sage advice and real-life anecdotal discussion about whichever cartridge you're checking out. Ken Waters takes dry ol' data and mixes it with good advice and common sense, and makes it easy to understand while he's at it.
Read the Review of Ken Waters' Pet Loads Book