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Long Range Hunting & Shooting
What would cause this? Bullet drop with elevation change
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<blockquote data-quote="Capt RB" data-source="post: 2048940" data-attributes="member: 85987"><p>Here is very basic information on how light refraction will change the location of an image</p><p>[URL unfurl="true"]https://en.wikipedia.org/wiki/Atmospheric_refraction[/URL]</p><p>Add in optics and you will have changes from what is seen to what is actual. Just like shooting in heavy mirage. The target is lower than it looks through the shimmer. Just like a zero moving throughout the day as the sun moves around in the sky. This is because the light is bending differently causing the zero to seem to shift when it is the image that is shifting.</p><p>Your humidity statement is correct if you are shooting the same condition at the same location minus the humidity. Once you change altitude you would correct off of the zero condition for that load. I use da because I know from my dope how to adjust as the weather changes. Although I always noticed and recorded how my zero would shift from morning to midday to dusk I didn't know why until I read an article by David Tubbs time of day changing his zero at Camp Perry. Ask a surveyor they will have a book on it as they are recording data every day in every weather. They can explain it far better than I can</p></blockquote><p></p>
[QUOTE="Capt RB, post: 2048940, member: 85987"] Here is very basic information on how light refraction will change the location of an image [URL unfurl="true"]https://en.wikipedia.org/wiki/Atmospheric_refraction[/URL] Add in optics and you will have changes from what is seen to what is actual. Just like shooting in heavy mirage. The target is lower than it looks through the shimmer. Just like a zero moving throughout the day as the sun moves around in the sky. This is because the light is bending differently causing the zero to seem to shift when it is the image that is shifting. Your humidity statement is correct if you are shooting the same condition at the same location minus the humidity. Once you change altitude you would correct off of the zero condition for that load. I use da because I know from my dope how to adjust as the weather changes. Although I always noticed and recorded how my zero would shift from morning to midday to dusk I didn't know why until I read an article by David Tubbs time of day changing his zero at Camp Perry. Ask a surveyor they will have a book on it as they are recording data every day in every weather. They can explain it far better than I can [/QUOTE]
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What would cause this? Bullet drop with elevation change
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