Sight Adj

An imaginary line down the center of the barrel's bore is called the line of departure (LOD). Likewise, what you see in the center of the sights is called the line of sight (LOS). Sight adjustment is simply the angle between these two lines. This angle is measured in minutes-of-angle (MOA), and the fact that there are 21,600 MOA in a full circle (21,600 = 60 x 360) shows how small this angle is.

Usually, the sights are set so the bullet goes above the line of sight 10 to 30 yards from the muzzle and falls back below the line of sight 50 to 500 yards down range. The zeroed range is where the bullet falls back to the line of sight. Increasing the sight adjustment by one MOA raises the bullet's impact point by 1.05 inches at 100 yards.