BB,
what I meant was, if CIP "Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives C.I.P" introduce a cartridge into their datatables, every proofhouse will then take this data.
I once ordered a .400 CorBon change barrel for my 1911. As this cartridge is not in CIP the german proofhouse took the SAAMI data for proofing. Guess it is SAAMI, at least they had the information from the US.
Tom