Online Training Lesson Preparing for your Ballistic Solver
The question has come up about Truing software and getting the most out of your ballistic solver. This is going to be a 2 part lesson because I feel it needs more than just working with the computer to be understood.
The computers are actually really good, the problem is with us and how we release the shot. We need to understand no computer software is modeled with a shooter operating the rifle. How we manage recoil will matter.
My advice is to start off at the range without any computer and once you have established your dope, don't ignore the wind. The wind is the biggest factor and it effects more than just horizontal drift. By adding in the wind values we help cancel out of the drifts the computers are accounting for out. Our information wraps all that up in our dope. So sometimes adding it in with the computer is doubling up on the solutions.
I always recommend to new shooters to turn the Spin & Coriolis off and first attempt to True the computer with nothing extra turned on. Also you have to know what your particular solver is correcting for ? I find Applied Ballistics to use much more information to change the data vs JBM. Because of that I can get a fast, accurate solution from JBM where I have to make sure everything is perfect in Applied Ballistics.
An example of this, using a 1-8 twist vs a 1-8.5 Twist in the software has .5 Mil correction change at 1000 yards with my rifle in this video. So that means you may have to actually measure your rifle's twist rate to use AB. What if your 1-10 is a 1-10.3 ? Different lots of metal can change the value of the twist rate when it is being cut. I find Applied Ballistics to be much more specific. I believe it was Ballistics AE when I changed the twist rate and nothing changed. Try it ?
In this lesson, which is pretty long, I doped my rifle to 1000 yards. The process started off by:
1. Mounting the scope level. I used a Level - Level set up, with a deck of cards to line up the flat of the scope to the rail.
2. I checked level on the range in position with a 4ft Level at the target.
3. Zeroed the Rifle at 100 yards and reset my turrets
4. Gathered dope on steel from 200 to 1000 yards recording both Wind & Elevation changes. I wanted POA to equal my POI.
5. I Chronographed 47 shots throughout the process using the Labrador.
6. Upon return I began working with each piece of software.
The conditions this day were:
Absolute Pressure: 25.23
Temperature: 68 to start, 72 to end
Wind: 9 MPH for a High, 7 MPH for an Average, 3 MPH for a Low
Rifle: Spartan Precision 260REM ?Ammo: Copper Creek 136gr Scenar L
We will talk muzzle velocity in a second, because it varied a lot.
First 5 Shot Muzzle Velocity Average:
That gives me a 5 shot average of 2870fps
Having recorded 47 shots, the Labradar gave me for totals:
ES : 108
SD : 21.1??That is quite a bit of variance and if I just choreographed 5 shots my numbers would have been off.
DOPE in Mils
200 yards .3
300 yards .9
400 yards 1.6
500 yards 2.5
600 yards 3.4
700 yards 4.1
800 yards 5.2
900 yards 6.2
1000 yards 7.4
Use this information to work up some practice loads of your own. ??The next lesson will explore software in depth but I wanted to include JBM so you can see what results I had from just a first try.