IMO,its not wrong to have a Sierra,a Nosler,a Hornady,and a Hogdon manual.
I'm not saying you need them all,but each one has its own gold nuggets inside.
They make good bathroom reading, too. Hornady's 5th and Lee's books have a lot of material on the "why" of things, with lots of interesting anecdotes ...... good stuff to know and food for thought.