I have the Nosler 5 & 6 manuals.
Most of the data pertaining to charge weight and velocity is exactly the same for most cartridges.
However, there are some differences.
For example, the load density is different through out. No 6 manual has higher load density with the Nosler brass.
If you look at the 280AI as an example, the data has more powders listed, and the velocities listed are not the same for the 140 and 160 grain bullets.
In other cartridges, it is the same data with the exception of load density.
I look at manuals as a guide or reference. I also look at multiple sources for load data simply as a means to check and recheck. After all, my gun, chamber, barrel, etc., isn't the same exact one their data was developed in. So I look at all my resources and use them to make sure I'm not doing anything to put myself at risk.
Even on my wildcat rounds, I still use load manuals/booklets, etc., and compare cases of simar design and capacity for reference purposes.
The more data/knowledge one has available, the better equipped one is to make informed decisions and choices.
Regards,
Rog