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NOVEMBER 26th 2021



BALLISTICS

AMMUNITION SAFETY
LOMBARD CALCULATION
REVERSE MILLER'S

in x 25.4 = mm
grain x 0.064799 = g
ft x 0.3048 = m
fps x 0.3048 = ms

mm / 25.4 = in
g / 0.064799 = grain
m / 0.3048 = ft
ms / 0.3048 = fps


appliedballisticsllc.com
saami.org
cip-bobp.org

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BALLISTICS



With many years of experience as a long range shooter, I enjoy shooting with open sights, without supports, at distances of 1000 meters and beyond. All enthusiasts in this field have to dig into the ballistics field from time to time. While every advice and its opposite can be found on the Internet, the science remains the same. Perhaps the easiest read is Brian LITZ's (appliedballisticsllc.com) Applied Ballistics for Long Range Shooting.

Yet, some formulas, while useful, are often unpalatable. This is why we have reworked Miller's formula (stability prediction) to present results in a more useful way (selecting rifle pitch to match the the chosen ammunition). We have also developed the so-called LOMBARD calculation to predict the form factor (i7) of a projectile on a G7 basis. While our formula draws a lot from the calculation proposed by Brian LITZ in his book, it does not require adding a correction factor.

However, we will not cover topics that can easily be found elsewhere, such as the explanation and application of the Magnus effect, or Coriolis, to the shooting field. As can be seen with competition shooters' targets, Magnus is largely ignored. And considering that in any case, at 1000 meters the maximum effect of Coriolis is in the region of about 7 centimeters... we suggest you focus on decent groupings at 1000 meters before making any attempt to refine any further. Anyway, with two-dimensional (2D) shooting, ballistics theory serves almost no purpose. It is, however, essential for three-dimensional (3D) shooting, i.e. with changes in distance and/or direction.

Considering official ammunition data tables, the two world references are CIP (www.cip-bobp.org - Table) and, for USA, SAAMI (www.saami.org). A word of caution: these two bodies sometimes provide different dimensional standards for the same caliber.



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