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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Humidity effects on External Ballistics.
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<blockquote data-quote="Mikecr" data-source="post: 678008" data-attributes="member: 1521"><p>Relative humidity plays more of a role at higher temps.</p><p>For example:</p><p>105VLD ICAO G1 BC @ 3Kfps = ~.525</p><p>ICAO = 59degF, 0%RH</p><p>Change only to 90%RH local BC = ~.528</p><p>Insignificant(.003)</p><p></p><p>Now, change to 100degF, 0%RH local BC = ~.566</p><p>And 100deg, 90%RH local BC =~.579</p><p>A little more significant(.013)</p><p></p><p>At 1kyds drop changes from RH spread:</p><p>@.525, drop = 320.8</p><p>@.528, drop = 319.8</p><p>1" drop diff</p><p>(also 0.6" in 10mph drift)</p><p></p><p>@.566, drop = 307.5</p><p>@.579, drop = 303.8</p><p>3.7" drop diff</p><p>(also 2.1" in 10mph drift)</p><p></p><p>No predicting change to tune really.</p><p></p><p>Most consider these differences to be insignificant, as they have considered so with horizontal & vertical coriolis, gyroscopic drift, and magnus effect.</p><p>It's when you start adding all these together that single shot ACCURACY becomes more of an abstract.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 678008, member: 1521"] Relative humidity plays more of a role at higher temps. For example: 105VLD ICAO G1 BC @ 3Kfps = ~.525 ICAO = 59degF, 0%RH Change only to 90%RH local BC = ~.528 Insignificant(.003) Now, change to 100degF, 0%RH local BC = ~.566 And 100deg, 90%RH local BC =~.579 A little more significant(.013) At 1kyds drop changes from RH spread: @.525, drop = 320.8 @.528, drop = 319.8 1" drop diff (also 0.6" in 10mph drift) @.566, drop = 307.5 @.579, drop = 303.8 3.7" drop diff (also 2.1" in 10mph drift) No predicting change to tune really. Most consider these differences to be insignificant, as they have considered so with horizontal & vertical coriolis, gyroscopic drift, and magnus effect. It's when you start adding all these together that single shot ACCURACY becomes more of an abstract. [/QUOTE]
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Humidity effects on External Ballistics.
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