April 2026 (2) - Flipbook - Page 33
average velocity and the calculated BC data. Accurate down range
velocities are then calculated out
to 1000 yards. One can do this
too 1 mile if you wanted too. For
our current purposes 1000 yards
is generally all we require at this
time.
JBM and Brian Litz’s Applied
Ballistics are two separate companies, yet JBM uses a considerable amount of Applied Ballistics
data for their calculations in their
App. Especially the Doppler Radar data that Litz has generated.
Interestingly enough Litz’s unit is
manufactured by the same company that builds the Labradar.
We will rely heavily upon both
JBM and Litz, to hopefully gain
a better understanding of this
phenomenon.
The end result from the JBM
calculators, is that we are able
to predict with a high degree of
con昀椀dence, our preferred bullet’s down range speeds, with a
high degree of accuracy. We are
then able to determine at what
distance, our choice of bullet
employed in the test, reaches the
PIP threshold. Further inputs
of density altitude, barometer
pressure, humidity, and temperature will only 昀椀ne tune the
data we have generated. Thus
enhancing the accuracy of the
results, that were forthcoming
from this data. To do this though
requires an accurate BC for your
choice of bullet. The only method
available to the amateur ballistician currently is the labradar,
however Caldwell has a new unit
out. I have no experience with it,
at a sticker cost of approximately
$600 I am not jumping on it. The
labradar radar unit uses Doppler
Radar, the Caldwell unit uses
what is called Chirp Radar. Some
of these reviews I have read were
not overly 昀氀attering about the
Caldwell Velocitadar.
The information that I was primarily after, was at what point
down range, did my choice of
bullet cross that invisible barrier,
at .8 Mach. What I now refer to,
as the PIP, and was that, which
possibly caused the occasional
unexpected accuracy issues at
900 yards.
A unexpected but welcomed
side bene昀椀t of my testing, while
being able to adjust velocity up
or down, by varying my powder
charge. This gave me the ability
maximize my bullet’s Ballistic
Coe昀케cient. By adjusting the
powder charge, then plugging in
the velocities recorded, from my
labradar, into the JBM calculators. This is just the beginning of
our journey I believe. However I
now have a deeper understanding of whats going on down
range and ideas on minimizing
Kenny inspecting the back side of the infamous Wasserburger Mile target. Note the dimples all
over the steel plate. These ri昀氀es retain signi昀椀cant energy even out to a mile. The 昀氀at spot in the
center is the location of the 40” bullseye.
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God bless Black Powder!
