Hard to say. If you mean a rifle in excellent condition and all original military, it could be worth plenty. According to the American Rifleman, an original 1903 Springfield with all matching numbers, the proper proof marks etc. to validate that it is as originally issued could be worth $3,000. They built lots of them but only a handful remain in original, as issued condition. Many had arsenal rebuilds and are worth much less. Krag production was much lower, of course.