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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help: Gun vs.Target - steep shots, barometric adjustments with big elevation change?
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<blockquote data-quote="Buffalobob" data-source="post: 190531" data-attributes="member: 8"><p>Well, before you asked the question and got me to thinking about it, I had always assumed that the difference in the uphill drop and the downhill drop was caused by gravity accelerating the bullet when it is going down hill and slowing the bullet when it is going up hill. Thus causing a longer time in flight and more drop on the uphill shot than the down hill shot. Whether the altitude density change factor is included in JBM, I do not know because it is a smaller effect than the gravitational effect.</p><p></p><p>The PDA version of Exbal does not take into account whether you are shooting uphill or downhill and therefore does not automatically take into account altitude and temperature differences between the shooter and the target. You could enter the midpoint data if you wished and make a correction that way as a first approximation. Of course you realize you have the uncorrected larger error of up versus down from gravity but fortunately they are partially compensating errors.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 190531, member: 8"] Well, before you asked the question and got me to thinking about it, I had always assumed that the difference in the uphill drop and the downhill drop was caused by gravity accelerating the bullet when it is going down hill and slowing the bullet when it is going up hill. Thus causing a longer time in flight and more drop on the uphill shot than the down hill shot. Whether the altitude density change factor is included in JBM, I do not know because it is a smaller effect than the gravitational effect. The PDA version of Exbal does not take into account whether you are shooting uphill or downhill and therefore does not automatically take into account altitude and temperature differences between the shooter and the target. You could enter the midpoint data if you wished and make a correction that way as a first approximation. Of course you realize you have the uncorrected larger error of up versus down from gravity but fortunately they are partially compensating errors. [/QUOTE]
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Help: Gun vs.Target - steep shots, barometric adjustments with big elevation change?
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