i have only the one- a speer 11- everything else is on the 'net- but i only shoot maybe 5 calibers and they've been around a LOONG TIME- 223, 308, 338, and 9mm, 45acp, and 44 mag- so they're well established and common- the lyman 48-49 has "softer" loads but they also give pressures- i see NO REASON to add calibers to my armoury, and one book will do
choose the calibers you want, then look them up on the net- there's a lot of ONE TIME information in most of the books, ie you read it one time, do the procedure, and then never use it again, unless you don't "keep your hand in" and forget it- all i ever use mine now is for the charge tables and trajectories- there's also a very good video by the reloading manufacturers network or some such which shows how to reload so i question if you even need a book at all