SAAMI Specs are developed in a custom made pressure barrel, for their standards.  Each ammo mfr. has their own pressure barrels to test their own ammo.  Whether the chamber size on these pressure barrels uses the dimensions of the loose Norwegian Krag chamber or the tighter chamber dimensions of the Swedish Mauser is unknown.  It makes sense that the larger chamber dimensions of the Krag chamber would tend to lower the pressure relative to the tighter Swede chamber for a given cartridge loading.  However, the difference is also unknown.  Looking at fired primers is not altogether accurate in determining pressure either.

So, as Bob_S said, looks like your only option is to handload and invest in a chronograph - and, even then, you won't know precisely what chamber pressure you're developing.  Develop a good slow load, go to the range and shoot the damned thing.