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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="WildcatB" data-source="post: 190462" data-attributes="member: 10379"><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> Thanks mattj... what you said is right..I'm not good with words...the difference at 2000 yards between the elevations given above is 16" which is .7639 minutes at that distance. (inverse tangent of (1.3333 ft divided by 6000 ft)) This seems significant to me.</p><p></p><p>Splitting the difference sounds like a good idea... but I'm guessing it's something that a physics person should be able to figure out exactly assuming constant variation of pressure as altitude changes. I'm sure it's already been done by someone.</p><p></p><p>If no one speaks up I suppose I could run some tests, make drop charts at the different elevations, then see what happens at the angles up and down, compare to values from existing ballistics programs, find out if there is a significant change, and if so, backwards match my results to a pressure matching my results...and THEN hopefully come up with a way to correct for the difference... That's a lot of variables and I just don't know if I'd be able to shoot good enough groups to get usable data. gun) </p><p></p><p>Hopefully someone will know.</p></blockquote><p></p>
[QUOTE="WildcatB, post: 190462, member: 10379"] :) Thanks mattj... what you said is right..I'm not good with words...the difference at 2000 yards between the elevations given above is 16" which is .7639 minutes at that distance. (inverse tangent of (1.3333 ft divided by 6000 ft)) This seems significant to me. Splitting the difference sounds like a good idea... but I'm guessing it's something that a physics person should be able to figure out exactly assuming constant variation of pressure as altitude changes. I'm sure it's already been done by someone. If no one speaks up I suppose I could run some tests, make drop charts at the different elevations, then see what happens at the angles up and down, compare to values from existing ballistics programs, find out if there is a significant change, and if so, backwards match my results to a pressure matching my results...and THEN hopefully come up with a way to correct for the difference... That's a lot of variables and I just don't know if I'd be able to shoot good enough groups to get usable data. gun) Hopefully someone will know. [/QUOTE]
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Help: Gun vs.Target - steep shots, barometric adjustments with big elevation change?
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