That is certainly one of the most unusual Krags I have seen. Kind of interesting someone did all that work, and left the magazine cutoff.
Almost certainly done before WW II, and possibly done before WW I, but that's just a guess. Interesting stock. Whoever did it knew what a stock needed to be for durability, and still managed some grace.
It's rather well done, clearly meant to be a working rifle, with better balance than the GI version. Replacement rear sight, too.
If the bore is still good, and it is mechanically sound, it would still be a good hunting rifle.
Krags only have one locking lug and cracks have been known to develop. If you plan to shoot it have it checked by a professional with the equipment to look thoroughly. Better to find out its a wall hanger before you have to remove the bolt from your face!
If it is sound shape for shooting, factory ammo can be had (not cheap, but nothing is these days). Dies and brass for reloading are available also.
If you choose to handload, NEVER hot rod a Krag rifle. (old gun, old steel, ONE locking lug, etc.)
At one time, or another the .30-40 Krag has killed dead about everything that walks in North America. I've had a couple Krags over the years, and even have a Ruger No.3 in .30-40. The penetration of a 220gr (or even the 180) at what are today considered very moderate speeds, simply has to be seen to be fully believed. And the right bullet will even expand a bit.