As somewhat of a newb myself, my first modern era manual was to upgrade from our old Lyman 45th to a 50th. Yes, there have been lots of changes, but as for the basics, remarkably the same. Some of the loads are even the same. But as for the manual itself, in my opinion, they could have done better. In the up front "how to" sections, a lot of duplication, while a lot of things on how to of load development missing. Then some really complicated stuff that wouldn't matter to 99% of their readers. They go from grade school to high school to grad school......but skipped past college. Even so, of the 6 or so hard copy sources of load data I have, the Lyman 50th is the most complete.
As for the load data itself, what all appear to do is to present an a small selection of commonly available powders, but none of them list them all. They tend to stick with the most popular all stars......some from each brand, and fast to slow for the caliber and bullet. What one omits, another may include, ergo the need for multiple sources. I also find it remarkable that start load for some is close to max load from others. Yet another reason to have multiples. I have adopted habit of finding at least 3 sources of load data for the powder and bullet I'm using and consider all 3 when looking at my start and max loads.
Of the manuals I have, load data in the Lee Reloading manual is the most complete, and includes a lot of data on powders none of the others have, but even that doesn't have them all. Only place I've seen reference to Shooter's World powders is in the Hornady handbook.
But as for the 6.5 Creedmoor, I find it almost falling down funny that is the least covered popular caliber in the Lee manual. In some cases, they only list 4 or 5 powders, while the same bullet in 260 Rem may have a couple dozen powders. I am loading for the 6.5 Creedmoor, and best sources of data have been Lyman 50th, Hornady Handbook and the Hodgdon 2021 Annual.