Addressing this subject logically, one of the important fundamentals of setting up on your target and being able to hit it begins with a solid shooting platform. About a decade ago I was with a very good and long time friend, glassing on a hillside. The area had been ranged and the target reference points established. Back then, laser rangefinders were not an option and we did not carry the Swiss made optical range finder; so we used our mil-dot reticles to accomplish the task. One of our target reference points was an intersection of two dirt roads. Figuring the tire tracks were 10 inches wide, we used that as our constant. (.36 yards X 1000 =360; 360 / .4 mils = 900 yards). Then we calculated the cosine number of the angle in which we were holding at to obtain our corrected for gravity distance, (900 yards X .87 = 783 yards). This was our best guestimate, however when the quarry walked into the box, the trigger was pulled and the round hit, but off center and to the left approximately 4 inches. We were lucky to be able to utilize the prone firing position as it provided great stability for the shot.
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