The
Funny you mention Hornady's top loads; a friend donated me his old Hornady Third Edition reloading manual from 1980, and the top "red lined" max loads are/were significantly hotter than their latest manual I have from a few years ago, (think it's the Ninth edition). It's not just updates from new powder mfrs either, e.g. 2400 going from Hercules to Alliant.
I wonder how much of that is due to the lawyers getting involved? Conversely the Lee Second Edition is almost useless to me, as their max loads are entry level loads everywhere else.