You have a sporterized 1898 Krag. The original barrel length was 30" with a soldered-on front sight base. Yours has been cut to 22" (the most common "carbine" and hunting rifle length) and an aftermarket front sight base sweated on. The stock is most likely a commercial one that looks like it was rather amateurishly checkered. Original stocks were straight, although some were altered with additional wood glued to form a curve.
If it's in good shootable condition it is worth something as a hunting rifle, and Krags in any kind of decent condition should be worth at least $500.00.
You can buy brass for it and reload, or you can use .303 British brass run through a .30-40 sizer and loaded with .308 bullets. Stick to mild to mid-pressure loads and the old girl will put venison in the pot for your grandkids.
Violence is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and valorous feeling which believes that nothing is worth violence is much worse. Those who have nothing for which they are willing to fight; nothing they care about more than their own personal safety; are miserable creatures who have no chance of being free, unless made and kept so by the exertions of those better than themselves. Gary L. Griffiths, Chief Instructor, Advanced Force Tactics, Inc. (Paraphrasing John Stuart Mill)