The idea of using the front sight to estimate range is an old one The technique works with any rifle. Using this technique the sight post coverage at 100 yards can be worked out in advance and used in the field.


First find the distance from your eye to the front sight....for example 30 inches. Then multiply the distance times the constant for a Minute of Angle..or .0003(see below note) Now divide the width of the front sight by the product..in this case .009 (30 x .0003 = .009). The answer is the area in inches that the front sight is covering at 100 yards. The effect is linear so double the value for 200 yards.

[For any range a minute of angle equals 6.2832 times the range divided by 21,600 or .000291]