A couple of things to consider and differences between the U.S. and Norwegian Krags.  The Norwegians actually had two locking lugs: the one on the front of the bolt face and the guide rib which contacts the rear ring of the receiver (unlike the U.S. model which does n0ot make contact).  Also, the metalurgy on the later (after 1910 or so) Norwegians is vastly superior than the steel used to make the U.S. model, which went out of production in 1903.

SAAMI Specs for U.S. made 6.5X55 ammo is 46,000 cup/51,000 psi.  European 6.5X55 is loaded quite a bit hotter (too hot for the Norwegian Krag and maybe even the Swedish Mauser).  If reloading, I'd stay 20% below any max load shown in a reloading manual and stay away from fast powders except for cast bullets.  My own personal favorite is a Hornady 140 gr SP ahead of enough 4350 to make it go 2400 fps.  I wouldn't worry about occasionally firing U.S. Mfd ammo in 6.5X55.  But I don't think I'd want to fire off 5 boxes every week.  Reloading this cartridge for a Norwegian Krag is a good example why you should use a chronograph when working up loads.


Carl D.