Boy you come up with some treasures Lancaster!
Thank you for sharing & making us aware of some surprising innovative developments that have happened over your side of the world!

Correct me if I'm wrong here - the old 11.7x40 R Greenland cartridge was obsolete, so the powers that be resleeved in a newer 8x58 Krag barrels (Assuming here rebored to 11.6x40R danish) hence smoothbored & the reason why there is a second thread on that barrel?

From the article:-
"The Remington 1867 breech-loading rifle was used in the Danish army until 1919 and in its navy until its complete replacement in 1942.

Part of these rifles, very old but perfectly functional, were sent to Greenland (autonomous territory of the Kingdom of Denmark) as hunting rifles.

The original cartridge for this rifle, 11.7x51.6 R, was no longer in production so a solution was developed to keep these venerable weapons active.

Thus, 8 mm M1889 8 x 58 R Krag-Jorgensen sheaths were used that have the same measurements but cut them just below the shoulder, where both cartridges differ.

This cartridge was in production until the mid-1960s as the "Greenland Cartridge". There was an 11.7x41 R Danish Mod. 1878, but although the measurements are similar they have nothing to do with it.

The "Greenland Cartridge" was built after WWII on recycled military pods, often with pistons marked NP (Norma Patronenfabrik). The Royal Greenland Trading Company appears to have converted some 8 x 58 R Krag-Jorgensen rifles to this caliber.

Typically, they are loaded with black powder and lead bullets with a grease slot. The length of the sheath varies between 39.5 to 40.3 mm. All have military markings from 1910-1942, and some have the symbol '*' or 'o' that indicate previous refills."

One way of getting around a logistical problem I guess!