Powders change.
Take a look at the current manufactured H4831 (ADI) vs. the original surplus H4831. Is there no wonder the original O'Conner load is no longer listed!
Couple stuff like this along with new and better pressure testing equiptment, and of course possible legal consequences.
This all adds up to one thing.
Use current data, and cross refrence with some older data, tempered with prudent load development in your rifle.
