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
https://theoverwatch.wixsite.com/theoverwatch/blank-page
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.
Where Does The Wind Matter?
https://kestrelinstruments.com/mwdownloads/download/link/id/100/
Official Overwatch website:
https://theoverwatch.wixsite.com/theoverwatch
Using the clock method, Every 30 Minutes Is A 15º Angle:
12:00 - 0º - 0
12:30 - 15º - .25
1:00 - 30º - .50
1:30 - 45º - .70
2:00 - 60º - .86
2:30 - 75º - .96
3:00 - 90º - 1
In this episode, we discuss how to get your wind angle and SIN. This will be used in our formula to calculate and dial our wind correction into our scope.
https://theoverwatch.wixsite.com/theoverwatch/blog
Using the clock method, Every 30 Minutes Is A 15º Angle.
12:00 - 0º - 0
12:30 - 15º - .25
1:00 - 30º - .50
1:30 - 45º - .70
2:00 - 60º - .86
2:30 - 75º - .96
3:00 - 90º - 1
N - E = 0º - 90º
E - S = 90º - 0º
S - W = 0º - 90º
W -N = 90º - 0º
Ranging Formula For Mils
Target size in inches x 27.77 / Target size in Mils
10" target measuring .5 Mils wide
10 x 27.77 / .5 Mils = 555.4 Yards
Click Value Formula
1/100 distance in yards / 2.777 x click
500 yards with .3 Mils = 3 clicks
5 x 2.777 / 3 = 5.4"
Episode XVI - Practicing Fundamentals of Marksmanship
Steady position
Sight picture/alignment
Controlled breathing
Trigger control
In this episode, we review how to build our Quick Drop Chart. The data we need for this is our Trued Dope from 100 - 1000 Yards, wind correction per 1 mph, cosine angle, Coriolis and spindrift correction, quick wind number, quick dope number, and optional quick drop numbers for bracketing. To see an example of the chart visit: https://theoverwatch.wixsite.com/theoverwatch/inventory
In this episode, we are going over how to build the chart with Excel to make our quick drop chart.
To make long-range hits, you must true your muzzle velocity and use the correct B.C. We go over that in this episode of The Overwatch!
I use the B.C. from Applied Ballistics by Brian Litz. The B.C. is measured at Mach 1.2 or just before Transonic. Once you have updated your B.C., you will need to shoot out to your bullet's maximum effective range (Mach 1.2) or as close to it as you can get. In your ballistic calculator, you will update your drop chart to how many Mils or MOA you need. This will true your muzzle velocity. Then confirm from 100 yards out to distance.
Using the quick drop number to memorize your dope is much easier than remembering multiple 4-digit numbers in MOA. This is why I think using Mils is better because it’s easier. With a few simple formulas and basic math, you can easily make hits out to mid and long-range on the fly.
In this episode, we are learning how to fill out our calc forms/firing solution page from Ballistic XLR. By TiborasaurusRex and Ballistic XLR You can also get more information from Meccastreisand and TiborasaurusRex on YouTube.
UPDATE - This is an older method and is still good to use to learn the math, and as a backup, For mid-range shooting out to 800+ yards, I recommend
building a quick drop chart. This is covered in Episode XII, Episode XIV, and Episode XV.
In this podcast, I discuss the formulas to determine distance using the reticle in your scope and just touching on the wind formula.
Milling Formula:
(target size) in inches x 27.77 / (target size in Mils)
10" target measuring .5 Mils wide
10 x 27.77 / .5 = 555.4 Yards
Milliradian-based Reticles
YARDS
Target Size (Inches) x 27.77 ÷ Target Size (Mils) = Distance (Yards)
10 (Inches) x 27.77 ÷ .2 (Mils) = 1,388 Yards
10 x 27.77 ÷ .2 = 1,388 Yards
Target Size (Yards) x 1000 ÷ Target Size (Mils) = Distance to Target (Yards)
2 (Yards) x 1000 ÷ .25 (Mils) = 800 Yards
2 x 1000 ÷ .25 = 800 Yards
METERS
Target Size (cm) x 10 ÷ Target Size (Mils) = Distance (Meters)
25.4 (cm) x 10 ÷ .5 (Mils) = 508 Meters
25.4 x 10 ÷ .5 = 508 Meters
Target Size (Inches) x 25.4 ÷ Target Size (Mils) = Distance to Target (Meters)
10 (Inches) x 25.4 ÷ .25 (Mils) = 1,016 Meters
10 x 25.4 ÷ .25 = 1,016 Meters
Target Size (Meters) x 1000 ÷ Target Size (Mils) = Distance to Target (Meters)
2 (Meters) x 1000 ÷ 2.8 (Mils) = 714 Meters
2 x 1000 ÷ 2.8 = 714 Meters
Minute of Angle-based Reticles
YARDS
Target Size (Inches) x 95.5 ÷ Target Size (MOA) = Distance to Target (Yards)
10 (Inches) x 95.5 ÷ 1.25 (MOA) = 764 Yards
10 x 95.5 ÷ 1.25 = 764 Yards
METERS
Target Size (Inches) x 87.3 ÷ Target Size (MOA) = Distance to Target (Meters)
72 (Inches) x 87.3 ÷ 5.5 (MOA) = 1,142 Meters
72 x 87.3 ÷ 5.5 = 1,142 Meters
Target Size (Meters) x 3438 ÷ Target Size (MOA) = Distance to Target (Meters)
Target Size (cm) x 34.38 ÷ Target Size (MOA) = Distance to Target (Meters)
