Also, the 8x58R Danish Krag cartidge is nothing more than a 45-70 cartridge, necked down to accept a 8mm bullet.
Using the reloading date from "Cartridges of the World", I have pushed a 200 grain bullet to 2772 fps and 3412 foot pound muzzle energy.
Norma loaded the last 8X58R Danish fmj ammo sometimes in the fifties. Some of that ammo can still be found for about $ 2-3 a round, from a Danish gun dealer, which I believe is called "Arms Gallery" ?
Otherwise, ammo is easy to form from 45-70 brass, or in case of emrgency, also from 7,62X54R Russian. "Bertram" of Australia still produces cases for the 8X58R Danish Krag, but they have to be annealed before use, since they will split after one or few rounds.
The Danish Krag is a well made rifle, and very accurate and pleasant to shoot, and I have only experienced on shoot kills on deer with my fine specimen of that rifle.