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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chamber pressure changes with altitude
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<blockquote data-quote="Pdvdh" data-source="post: 1221266" data-attributes="member: 4191"><p>Here's logic. Small arms fire has been studied to death for generations, not years. For national defense purposes. The armed forces want to know and pay good money to find out.</p><p></p><p>Ballisticians recognize the affects of temperature on powder burning rates, and provide compensation for MV in their programs based on differing station temperatures. If altitude, in and of itself, affected MV in a statistically meaningful, and therefore consistent, reliable, and repeatable fashion, wouldn't the armed forces researchers and someone like Bryan Litz who earns a portion of his living studying and educating shooters of all walks and trades have documented the altitude affect on muzzle velocity with scientifically defensible means and methods? And after having documented the relationship between altitude and MV, then include an algorithm into ballistics programs to model the affect of altitude on MV for the benefit of the troops, or customers?</p><p></p><p>Small arms ballistics programs include algorithms for temperature, angle of fire, coriolis drift, wind speed, wind direction, spin drift & rifling twist rate, rifle cant, station pressure, humidity, and on and on. Each of these factors are proven, not with anecdotal evidence and old wives tales passed along over years and generations, but based on defensible science that can be repeated by any other qualified person employing the same scientific methods.</p><p></p><p>Why is there no MV correction based strictly on station altitude??? Logic will lead one to the obvious conclusion. Altitude in and of itself has no affect on MV.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1221266, member: 4191"] Here's logic. Small arms fire has been studied to death for generations, not years. For national defense purposes. The armed forces want to know and pay good money to find out. Ballisticians recognize the affects of temperature on powder burning rates, and provide compensation for MV in their programs based on differing station temperatures. If altitude, in and of itself, affected MV in a statistically meaningful, and therefore consistent, reliable, and repeatable fashion, wouldn't the armed forces researchers and someone like Bryan Litz who earns a portion of his living studying and educating shooters of all walks and trades have documented the altitude affect on muzzle velocity with scientifically defensible means and methods? And after having documented the relationship between altitude and MV, then include an algorithm into ballistics programs to model the affect of altitude on MV for the benefit of the troops, or customers? Small arms ballistics programs include algorithms for temperature, angle of fire, coriolis drift, wind speed, wind direction, spin drift & rifling twist rate, rifle cant, station pressure, humidity, and on and on. Each of these factors are proven, not with anecdotal evidence and old wives tales passed along over years and generations, but based on defensible science that can be repeated by any other qualified person employing the same scientific methods. Why is there no MV correction based strictly on station altitude??? Logic will lead one to the obvious conclusion. Altitude in and of itself has no affect on MV. [/QUOTE]
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Chamber pressure changes with altitude
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