I'd go to   (You need to Login and search for Krag. They usually have about 7 pages. You will rapidly see what is being asked AND what bids are being offered for guns in many grades of condition. Above all, be honest with yourself - if your gun has been "sporterized" in ANY way, or has some flaws, don't compare it to a minty "as-originally built".

BTW, odds are it is a veteran of the Span-Am War (1898-1901). WW1 usage, while not impossible, in rear-echelon troops, was minimal.