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 Measurements'
Updated: 08MAR2018 - Added section 'Reloading For Accuracy'
09MAR2018 - Added lots of tools and tips for reloading, worked on clean
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.
This is the script I am currently using to correct this problem.
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
Freight 120V wirefeed welder from AC operation to DCEN (Direct Current,
Electrode Negative) operation.
Why and how.
This is the work I started writing on the subject of reloading for
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 experience.
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 Physics.
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 was planning 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 - with very little success so far. However it is apparent
the Satterlee method does work, and uses half the shots my method
uses. Scott's method is worth a try if you have a good
chronograph, or are limited to a 100 yard range.
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 how to get the bullet out 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 extreme spread or
'ES' occurs at that point.
ANOTHER NOTE: I started out
thinking that small groups were the desired end state (thinking like a
Bench Rest shooter) however, after a little analysis of the importance
of consistent velocity, I have come to the conclusion that if you can
get your groups under 0.5 MOA, then you should try to get your 5 shot
standard deviation or 'SD' down to single digits. Once this is
accomplished, your time is better spent on the longer ranges learning
to read wind, and anticipating wind's effect on your shot.
I apologize in advance to those who find my notes to be long winded and
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 100
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 atmosphere
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°
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'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 me
This is my resume ... just for the heck of it , in case anyone want's to get to know me better: