I own loading manuals going back 15 years from numerous manufacturers, there are many differences just like you describe.
I have thoroughly tested, good safe recipes that are well above the stated max in other manuals, the biggest differences are cartridge case, primer, barrel length, and firearm used.
I would NOT put these in just any rifle and shoot them, some of these loads are for MY rifle alone.
NRA Lifetime Member Since 1999
"I ask, sir, what is the militia? It is the whole people except for a few public officials." George Mason