It is funny that the Wikipedia article shows .063 as the rim thickness and no mention of a change in 1905 as indicated on that forum. My inclination is the softer steel of the old Krags sets back the lugs and the headspace changes over the decades. I have seen it in the 2 US Krags in my family. I would expect the same in a Danish Krag as the better steels did not come on the scene till later.
If Buffalo arms will still sell you a box of .070 thick cases on trial do that. They will either chamber easily or not. If they almost chamber or chamber with difficulty trade for the .060 thick rims. Forcing the bolt to close on oversize rims would not be good for the long term health of the action.
One could check the free play in the bolt with it closed and the firing pin removed with a dial indicator.  .001 is the least I would want to see the thickest rim you can find, up to .010 play in the bolt would be acceptable.