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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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<blockquote data-quote="Mikecr" data-source="post: 1195565" data-attributes="member: 1521"><p>Gravity is difficult to predict. It changes with geographic density (like mountains) regardless of altitude. Dismissing this, your gravity difference from 6400 feet scenario could lead to .30" change at 1kyd. 1% BC would be 1.2".</p><p>So gravity, and given it's unpredictability, is really too small an affect to measure or account for with small arm ballistics(even at distance).</p><p></p><p>But technically it is a factor, and so is spin drift and vertical and horizontal Coriolis.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1195565, member: 1521"] Gravity is difficult to predict. It changes with geographic density (like mountains) regardless of altitude. Dismissing this, your gravity difference from 6400 feet scenario could lead to .30" change at 1kyd. 1% BC would be 1.2". So gravity, and given it's unpredictability, is really too small an affect to measure or account for with small arm ballistics(even at distance). But technically it is a factor, and so is spin drift and vertical and horizontal Coriolis. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Altitude vs. Barometric pressure
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