You’re not going to hit your target 100% of the time. And if you are, you need to move your target further back or make it smaller. Missing the target is part of long-range shooting, but there is a way to help increase your hit probability. That is simply by understanding the errors in the system. If you know the errors and how to incorporate them into your calculations, you can increase your chances of an impact.

Mil Formula

Target SIze (in) x 27.77 / Target Size (Mils) = Distance (Yards)

8*27.77/.42=528.9 yards

Wind Formula

Wind Speed (mph) / Gun Number x 1/1000 of Distance x Sine = Wind Correction in Mils

10/4*.53*.25=.33 mils

Target Wind Speed

Target size in mils / 1 Mph wind effect

.42/.03=14 mph

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1. Determine the wind speed.

2. Divide the wind speed by the Q.W. number.

3. Multiply the Q.W. dope by the quotient.

4. Determine the SIN of your wind angle.

5. multiply the product by the SIN of the wind angle.

EX.1 - 600 yards, with a 12 mph wind from 1:00 with a 4 mph gun

1. 12 MPH wind

2. 12 / 4 = 3

3. .6 x 3 = 1.8 Mils

4. 1:00 = .5 sin

5. 1.8 x .5 = .9 Mils to adjust for the wind

EX.2 - 600 yards with a 12 mph wind from 1:30

1. 12 mph

2. 12 / 4 = 3

3. .6 x 3 = 1.8 Mils

4. 1:30 = .7 SIN

5. 1.8 x .7 = 1.26 Mils to adjust for the wind

EX.3 - 700 yards, 15 mph wind from 2:00

1. 15 x 7 = 2.14

2. .7 x 2.14 = 1.49 Mils

3. 1.49 x .86 = 1.28 Mils

Use your bullets G1 B.C. to get your gun's wind number.

EX:

.308 - 175 SMK G1 B.C. - .505 = 5 MPH GUN

6.5C - 147 ELD-M G1 B.C. - .697 = 7 MPH GUN

In this episode, I explain the error with the bullet's "true B.C."

and how to correct that if it's needed.