Got a new Krag sporter with a front sight very similar - in appearance - to the Springfield band. I put a Lyman #48 on the back end, and after adjusting it, the slide is bottomed out; won't go any lower. Shooting it today, the rifle shoots 13.5 inches higher that point of aim at fifty yards, and 21 inches high at a hundred. I need to get a higher front sight blade - by how much?