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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Effects of atmospheric pressure on bullet drop at long range.
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<blockquote data-quote="richhymas" data-source="post: 2344497" data-attributes="member: 43504"><p>To answer the initial questions, the gun was zeroed at 100 yards, initial muzzle velocity was obtained at about 50 degrees F with lab radar. Pressure was around 25 mm Hg at the range. I confirmed the dope sheet out to 480 yards on steel. (7.0 MOA at 480 yards). I typically shoot at the range using front and back sand bags. </p><p></p><p>My Leika Geovid gave me an atmospheric pressure of 23 mm Hg on the mountain at 7500 ft elevation. I used the Ballsitic AE app on my phone and I changed the elevation and pressure to match. The shot angle was mild. 10 degrees or a bit less. I did use my pack as a front bag shooting prone with no back support other than my left hand. </p><p></p><p>Given the angle in the field I suppose the recoil of the gun may have lifted the barrel or the pack I shot off may have been more (springy) than the sand bags causing slight lift compared to the bench. </p><p></p><p>I guess this experience just highlights how subtle field differences really can affect the outcome when hunting and the more we practice in the field (shooting rocks etc) the more we identify the effects of field conditions on long range shooting. A high country horseback elk hunt is much different than long range "field" elk on private property.</p></blockquote><p></p>
[QUOTE="richhymas, post: 2344497, member: 43504"] To answer the initial questions, the gun was zeroed at 100 yards, initial muzzle velocity was obtained at about 50 degrees F with lab radar. Pressure was around 25 mm Hg at the range. I confirmed the dope sheet out to 480 yards on steel. (7.0 MOA at 480 yards). I typically shoot at the range using front and back sand bags. My Leika Geovid gave me an atmospheric pressure of 23 mm Hg on the mountain at 7500 ft elevation. I used the Ballsitic AE app on my phone and I changed the elevation and pressure to match. The shot angle was mild. 10 degrees or a bit less. I did use my pack as a front bag shooting prone with no back support other than my left hand. Given the angle in the field I suppose the recoil of the gun may have lifted the barrel or the pack I shot off may have been more (springy) than the sand bags causing slight lift compared to the bench. I guess this experience just highlights how subtle field differences really can affect the outcome when hunting and the more we practice in the field (shooting rocks etc) the more we identify the effects of field conditions on long range shooting. A high country horseback elk hunt is much different than long range “field” elk on private property. [/QUOTE]
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Effects of atmospheric pressure on bullet drop at long range.
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