I own Lyman and Hornady manuals. I reference the data from those against the powder manufacturer data. If the data isn't in a manual, as in the powder is newer than the manual, I use manufacturer data.
In any case, I look at my source data as a jumping off point. I also quite frequently end up above manufacturer and manual max. The key is I don't start there, I work my way there, testing and inspecting as I go up.
As far as the rest of the manual, you the part that is not data, you read that to learn the process. That's half the battle, learning what is and is not safe, and how to get it done. Once you know that, you'll be in good shape providing you know the basics.
In any case, I look at my source data as a jumping off point. I also quite frequently end up above manufacturer and manual max. The key is I don't start there, I work my way there, testing and inspecting as I go up.
As far as the rest of the manual, you the part that is not data, you read that to learn the process. That's half the battle, learning what is and is not safe, and how to get it done. Once you know that, you'll be in good shape providing you know the basics.