Started May, 2015.
most outstanding items into the notebook and re-indexed
Updated: 05MAR2018 - Added comments in 'Introduction to Reloading'
Updated: 08MAR2018 - Added section and comments 'Reloading
Updated: 08MAR2018 - Added section 'Reloading For Accuracy'
09MAR2018 - Added lots of tools and tips for reloading, worked on
23MAR2018 - Added Marksmanship, cleaned up index, reorganized
Updated: 30APR2018 - Reconfigured Site Security. Notebook is now
in its own public directory
Updated: 18MAY2018 - Additional Security Reconfguration
Updated: 07JUL2018 - Added section "Additional Stuff You Need" with
bench and target stand for starters.
Updated: 29JUL2018 - Added section "Eye Dominance" and "Dominant Eye
Finger Drill" under FUNDAMENTALS OF MARKSMANSHIP
and Future Projects
LabRadar 'TRK' folder files are not formatted for ASCII CSV.
How to reformat them for use in Unix based systems and OFIS Spreadsheet.
Here's the script I'm currently using
echo "Input " $1
echo "Output" $2
tr -cd '\11\12\15\40-\176' < $1 > $2
JSnell Consulting pages for Storm Tactical (or A5) DOPE book.
- In user testing. Pages available upon request, without
right to distribute
Start 'Exterior Ballistics' section in the notebook. Insert
current wind data.
Bushnell ConX & Kestrel Sportsman (Upgraded to 5700) Test and
Calibrating 36" Surveyors Tape to SLOW, MEDIUM, FAST wind - Is the
Kestrel 5700 fast enough to synch with photo's?
Reading wind in the spotting scope (focus short of the target, read in
bullet path, what causes mirage).
Lightweight, stable, portable shooting bench (bring info in from Mail
Lightweight, low cost, portable steel target frame. Update for
Harbor Freight 120V wirefeed welder from AC operation to DCEN (Direct
Current, Electrode Negative) operation.
Why and how.
This is the book I
started writing on the subject of reloading for accuracy.
As it got bigger, and more detailed, I realized I wanted to add
sections on other topics,
and the scope of the book is now limited only to my interests and
I started this project because I wanted to know how to quickly and
accurately adjust rifle reloading
recipes to achieve the best accuracy in a given rifle. Being an
engineer, I wanted to achieve the goal in a reasonable number of test
shots, and that's where the fun started.
In due course, it became apparent that understanding how a rifle and
its cartridge work (in excruciating detail) is critical to
understanding why adjusting loading
recipes provides the results it does. Thus the section on Initial
If you are only interested in how to quickly develop a loading recipe
you can just go straight to the section titled Finding
The Right Load.
I planed to condense Finding The Right Load into a step-by-step
tutorial, but about that time Scott Satterlee came up with the '10
Round Load Development Ladder Test', and I went
down the next rabbit hole trying to explain WHY his method works -
little success so far. However it is apparent the Satterlee
method does work, and uses half the shots my method uses.
NOTE: One spot where Scott (and a lot of other people) seem to have a
misconception is that rifle barrel 'harmonics' eg vibration, differs
significantly for a small change in velocity. This is not
true. For the same bullet, every time the gun is fired (within a
'reasonable velocity range') the barrel vibrates substantially the
same. What we all are looking for is is how to get the bullet
of the barrel when the barrel is moving upward, but before it
peaks. As Scott notes, he finds the charge range which exhibits
the lowest velocity variation, and then can load any 'reasonable'
powder to achieve that velocity with consistent success. My
problem is in finding out why a low ES occurs at that point.
I apologize in advance to those who find my notes to be long winded
micro-detailed. I am trying to document WHY and HOW things
happen, and any failure to make it interesting and readable is my
own. I hope at least some members of the shooting community will
appreciate a detailed description that might not be available
Ballistics - Wind Effects
Updated at random.
Competitive shooters have been using this old wind rose for decades.
I got to wondering how accurate it is for modern high BC long range
The Hornady 4 DOF exterior ballistics program accounts for drop,
aerodynamic jump, and wind drift. It also outputs directly to a
file that Office Spreadsheet can read.
In 4DOF I created an accurate profile of my 6.5 Creedmoor firing 143
grain Hornady ELDx bullets and tested the results on targets to 1,000
yards on the range.
Next, using Hornady's 4DOF, I entered 10 mph wind at 15 degree
intervals all the way around the shooter, and stored the results in
yard increments to 1,000 yards in the spreadsheet.
I did a little simple number crunching to combine all of the data into
bullet impact points in minutes of angle horizontally and verticall
away from the point of aim.
Finally, I took that spreadsheet data into AutoCAD and created a true
to scale drawing of the results.
This represents what the wind will do to a bullet very accurately, and
it's qute remarkable.
Next I changed the firing location to sea level, in standard
and ran the 143 ELDx again and added a new test on my 308's 175
Sierra Match King bullets. These charts are the result.
As I got more involved in these plots, I found that JMBALLISCTICS and
Hornady's 4DOF ballistics programs have a big difference from Advanced
Ballistics Mobile in the amount of wind drift this load experiences at
1,000 yards, particularly with respect to a wind from 9 O'Clock where
it adds to spin-drift.
The data below is for Hornady 143 ELDx, 2652 fps, 2473 ft ASL, 71.5°F,
Raw 4DOF output:
Wind 10MPH < 90°, 1000 yds; Total Come Up: +29.10,
Total Wind Drift (MOA): 5.93
Wind 10MPH < 270°, 1000 yds; Total Come Up: +29.68, Total Wind
Drift (MOA): -6.99
Raw JMBallistics output:
Wind 10 MPH <90°, 1000 yds; Drop (MOA): -29.1, Windage
Wind 10MPH < 270°, 1000 yds; Drop (MOA): -29.1, Windage (MOA); -5.2
Raw Advanced Ballistics Mobile ouptput:
Wind 10MPH < 90°, 1000 yds; Come Up moa*: U29.80,
Windage moa*; R6.15
Wind 10MPH < 270°, 1000 yds; Come Up moa*: U30.50, Windage moa*;
The plot below is my latest update replacing the Hornady 4DOF
above with AB Mobile data below. The AB Mobile app allows for
selecting wind by the O'Clock method, and I found it easier to plot
using the O'Clock value, so there are plots every hour (30°) below vs.
the 15° used above.
Here is an
article by Bryan Litz about the Hornady 4DOF
but I don't see where the differences he referrs to should be
responsible for the difference I see in this discussion.
To test for altitude sensitivity between my home range (2473 ft AGL)
and Sea Level standard atmosphere I ran the following in AB Mobile:
If the target is at Mud Lake (DA: 2473), in Spring (Temp: 71.5°F) then;
10 MPH < 3 O'Clock = U29.50, R6.00 | 10 MPH < 9 O'Clock = U30.20,
If the target environment is changed to sea level std. atmo. (DA: 0ft,
Temp: 59°F), then;
10MPH < 3 O'Clock = U29.40, R5.95 | 10 MPH < 9 O'Clock = U30.10,
The difference is negliglible for 1,000 yards.
The new wind plot shows an entirely different set of effects from
Aerodynamic Jump and Spin Drift.
I trust Brian Litz to get ballistics right. With that said, I
went back through my DOPE and found the AB Mobile solutions matched
real world conditions I had recorded over many days, firing locations,
weather and range. So I'm going to rely on AB Mobile solutions
from here on.
Now back to the original discussion.
I have plotted the wind effects at 100 yard, 200 yard, etc. and didn't
find much that isn't included in the 1,000 yard plots.
They don't exactly scale up linear, but the differenceds are smaller
than a typical shooters ability to hold, and would likely be masked by
downrange wind variations in any case.
I'm going to try this with some other bullets with lower BC's to see if
any part of the old chart was even nearly correct (I'm begining to
doubt it was).
I'm going to try some MV variations to see how much wind effect is
changed by X fps variation (this directly translates into TOF
I'm going to try some MV variations to see how much the POI changes for
X fps variation in zero wind. I think this may be useful for
establishing SD limits for useful long range loads.
And as always, I'm open to suggetions for additional research ... send