I am always flabbergasted by so many people advocating to get, and read, multiple loading books. What is the purpose of getting more than one good, modern loading manual? Do you think any one manual is incorrect? If that is the reason, then tell everyone what manual is in error, so no one else will buy it. Every modern manual gives complete, plainly written, instructions of procedures. Why would you want to read the same thing again, in another manual, with only slightly different wording?
Do you want to look in several manuals to pick out the lightest load for your gun? If that is the reason, I would suggest you go back to factory ammunition.
Do you want to pick out from several manuals the one that gives the highest loading for your gun? If this is the reason, it is not a very good way of doing things. You should always start at a lower loading and work up the load in your own rifle.