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When shooting long range and precision, you need to collect as much data as possible. You are working on building a D.O.P.E book (Data On Previous Engagement) and a Firing Solutions Book.
First, you need to collect data on the rifle itself. I use a one Inch ring binder for my firing solutions book. This data will be kept in this.
You will use this to collect further data and will be used as a reference. Type this up and put it in a plastic sleeve for your Firing Solutions Book.
RIFLE
* Make
* Model
* Serial number (optional)
* Caliber
* Barrel length
* Thread pitch (silencers or muzzle devices)
* Bullet / Load data
* Bullet length
* Zero (yards rifle is zeroed to) I use 100 yds
* Barrel Twist
* Powder (If you reload)
* Powder charge
* Primer
* Scope height
* Ballistic coefficient in G1 and G7
Here is my Data for Example.
RIFLE - REMINGTON
MODEL - 700 5-R GEN ll
CALIBER- .308
BARREL LENGTH - 24"
THREAD PITCH - 5/8 - 24
BULLET - 175 BTHP SMK, VARGET 43.5
ZERO - 100 YDS
BARREL TWIST - 11.25
POWDER - VARGET
POWDER CHARGE - 43.5
PRIMER - CCI LR
BORE HEIGHT - 1.63
BALLISTIC COEFFICIENT - .505 G1 .243 G7
Every time you go shoot you will need to collect data on your environmental factors.
You will need everything from time and date, to the sun's direction. How much data you collect will depend on how precise you want to be and how far away your target is. If you are just starting out, I would recommend collecting only the data you will be using. If you are not factoring in humidity then don't collect data on humidity.
OTHER DATA
This data will be collected every time you go shoot. It should be logged in your D.O.P.E book and later will be compiled and added to your Firing Solutions book.
* Date
* Time
* Temperature
* Barometric pressure (inHg)
* Humidity
* Heading
* Latitude degree
* Bullet velocity in FPS per 10°
* Air Temperature
* Bullet/powder temperature
* SD/ES (Standard Deviation Extreme Spread)
* Direction of wind
* Direction of sun
* How you are feeling
Also, this data may need to be collected multiple time per firing sessions.
An example would be early spring:
7 AM
42°f (may have Morning due, Humidity will be higher)
Humidity - 80%
Direction - due E (sun in your face)
Sun - 12 o'clock
Bullet/powder temperature - 42°
Felling good/Excited
1 PM (Sun directly above you)
75°f (humidity may lower)
Humidity - 40%
Direction - Due E
Bullet/powder temperature - 81°f
Feeling frustrated
So, let's break this down a little bit. From 7:00 a.m. when you first started shooting, to 1:00 p.m. the temperature is hotter, causing your bullet temperature to increase. This means your bullet speed will increase which will cause your bullet to hit high. With the Sun being above you, now your ammo may be in direct sunlight, causing your powder temperature to increase even more causing more velocity, resulting in even higher hits. At 1 p.m the air is thicker due to a decrease in humidity, this can actually slow your bullet down. If you don't account for these things you can miss your target and cause you to feel frustrated. This can and most likely will lead to improper fundamentals and will cause more misses.
EQUIPMENT!!!!!
* Chronograph
* Ballistic calculator (more than one) I like
Ballistic xlr and Strelok Pro
* Compass (2) one for headings, one for
cosines
* Lazer themometer
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