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Long Range Hunting & Shooting
effects of altitude on loads
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<blockquote data-quote="royinidaho" data-source="post: 434192" data-attributes="member: 2011"><p>Elevation, in and of itself, will not change 'load' characteristics.</p><p></p><p>Temperature will.</p><p></p><p>The difference in air density as elevation increases changes the bc of the bullet from where it was from a lower elevation. This is usually not enough for a miss or poor shot out to say about 700-800 yards. Beyond that it becomes an ever increasing factor with distance.</p><p></p><p>Most check zero at or near the new elevation and rely on developed drops from there.</p><p></p><p>The greater the zero distance the better things will be, up to a point. All my shots are long so I zero @ 200 yds for a flat shooter and 300 yds for a rig that shoots rainbow trajectories.</p><p></p><p>If drops don't match at the higher elevation, Ill to WY, look at what was done to make the chart match the drops. The method used may or may not have been the most appropriate.</p><p></p><p>I was told once, by one who I'm pretty sure knows, that a good workable rule of thumb is the MOA drop decreases about 0.1 MOA per 1000 ft of elevation increase. This has seemed to work when I tried it.</p><p></p><p>I live, shoot and zero at 4450' and hunt and shoot rocks from 5500' to about 8500'.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 434192, member: 2011"] Elevation, in and of itself, will not change 'load' characteristics. Temperature will. The difference in air density as elevation increases changes the bc of the bullet from where it was from a lower elevation. This is usually not enough for a miss or poor shot out to say about 700-800 yards. Beyond that it becomes an ever increasing factor with distance. Most check zero at or near the new elevation and rely on developed drops from there. The greater the zero distance the better things will be, up to a point. All my shots are long so I zero @ 200 yds for a flat shooter and 300 yds for a rig that shoots rainbow trajectories. If drops don't match at the higher elevation, Ill to WY, look at what was done to make the chart match the drops. The method used may or may not have been the most appropriate. I was told once, by one who I'm pretty sure knows, that a good workable rule of thumb is the MOA drop decreases about 0.1 MOA per 1000 ft of elevation increase. This has seemed to work when I tried it. I live, shoot and zero at 4450' and hunt and shoot rocks from 5500' to about 8500'. [/QUOTE]
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effects of altitude on loads
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