Apparently this is controversial.

I've seen a Boer-Krag (Boer Krags are Steyr-made 1896-1897 Norwegian M1894-like rifles having 2 or 3-digit SNs falling outside the Norway contract SN ranges and usually lacking Norway acceptance stamps; some are documented as used by ZAR in Boer-war) chronographing 3200 fps with 85 grain hollowpoints....and surviving Norma 139-grain softpoint factory loads

BUT

I found the following on another site:

You should not shoot full power Norma 6,5X55 hunting or match ammo in your Norwegian Krag. It is weaker than Swedish mausers and newer rifles. After the war (WW2) we had some blown up krag actions in Norway, and the pressure of the 6,5 Krag ammunition was set down to approximately 3000 BAR, later(in the 70s) it was even sat down to 2800 BAR (before WW2 pressure on Krag ammo was the same as pressure on swedish mauser ammo, approx 3100 BAR). Today 6,5X55 Swedish has a max pressure of 3800 BAR.

2800BAR = 40600PSI
3100BAR= 45000PSI
3800 BAR=55000PSI