I have an 1896 Swedish Mauser (6.5 x 55) and I would like to order a taller front sight (from Tradex) to bring my point of impact down. The front sight on my rifle is marked -0.5 and with the rear sight set as low as it goes, my poi is approximately 7" to 11" high at 100 yards (depending on load and/or bullet weight). Would someone be able to tell me what the markings on the front sight (+.25, +.75, +1.0, etc.) mean and/or suggest which front sight would get me on target??