Skip, from the 2006 Vihtavuori manual:

"All of this reloading information has been provided by Nammo Lapua Oy. The data given here were obtained in laboratory conditions following strictly the CIP (Commission International Permanente) June 13, 1990 and November 9, 1993 rules. The listed maximum loads have been determined according to the respective CIP/SAAMI maximum pressure specification, whichever is lower.
These test methods have been deemed to be safe throughout the world. Pressure is measured at the case mouth or from inside the case according to the CIP."

Lab data is one thing, looking at primers and guessing is another