SAAMI registered pressures are only loosely related to reality.
Load book recipes are only loosely related to SAAMI registered pressures.
The whole load book system is good enough for beginners.
If you are good at handloading, you can make up all of your own loads.
The 1905 8mm did 2900 fps 150 gr, and that was the limit of the brass.
The cartridge brass alloy has not changed.
So that rifle is up against a reality, and so it cannot change.
The 380 brass is capable of double the original velocity. There is no reality anchor for the handgun.
The word 'forum" does not mean "not criticizing books."
"Ad hominem fallacy" is not the same as point by point criticism of books. If you bought the book, and believe it all, it may FEEL like an ad hominem attack, but you might strive to accept other points of view may exist.
Are we a nation of competing ideas, or a nation of forced conformity of thought?