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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
MERC - Maximum Effective Range Calculator
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<blockquote data-quote="speedengineer" data-source="post: 1968079" data-attributes="member: 112986"><p>Here is an example of another use for MERC. How much does wind angle uncertainty matter when you are shooting with a headwind or tailwind?</p><p></p><p><strong>Situation:</strong> Shooting a 6.5 PRC with 143 ELDX into a 10mph headwind.</p><p>The shooter has to estimate the direction of the wind. There will always be some error in your wind direction call. Plus, wind is rarely steady and the direction is constantly changing. How does this uncertainty in wind angle affect the horizontal spread of your impacts?</p><p></p><p><strong>Case A (<span style="color: rgb(226, 80, 65)">Red</span>):</strong> 10mph straight headwind with 5 degrees wind angle uncertainty</p><p><strong>Case B (<span style="color: rgb(44, 130, 201)">Blue</span>):</strong> 10mph straight headwind with 25 degrees wind angle uncertainty</p><p></p><p>This simple example shows that your estimation of the wind direction can be just as important as your estimation of the wind speed!</p><p>[ATTACH=full]210925[/ATTACH]</p><p></p><p>Hit dist plot at 600 yards</p><p>[ATTACH=full]210926[/ATTACH]</p><p></p><p>[ATTACH=full]210927[/ATTACH]</p></blockquote><p></p>
[QUOTE="speedengineer, post: 1968079, member: 112986"] Here is an example of another use for MERC. How much does wind angle uncertainty matter when you are shooting with a headwind or tailwind? [B]Situation:[/B] Shooting a 6.5 PRC with 143 ELDX into a 10mph headwind. The shooter has to estimate the direction of the wind. There will always be some error in your wind direction call. Plus, wind is rarely steady and the direction is constantly changing. How does this uncertainty in wind angle affect the horizontal spread of your impacts? [B]Case A ([COLOR=rgb(226, 80, 65)]Red[/COLOR]):[/B] 10mph straight headwind with 5 degrees wind angle uncertainty [B]Case B ([COLOR=rgb(44, 130, 201)]Blue[/COLOR]):[/B] 10mph straight headwind with 25 degrees wind angle uncertainty This simple example shows that your estimation of the wind direction can be just as important as your estimation of the wind speed! [ATTACH type="full"]210925[/ATTACH] Hit dist plot at 600 yards [ATTACH type="full"]210926[/ATTACH] [ATTACH type="full"]210927[/ATTACH] [/QUOTE]
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MERC - Maximum Effective Range Calculator
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