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Long Range Hunting & Shooting
Vertical drift from crosswinds
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<blockquote data-quote="Mysticplayer" data-source="post: 5691" data-attributes="member: 8947"><p>Oli, the only way that a crosswind can impose a vertical component is if the wind is flowing upwards (thermal) or downwards (wind shear). These are usually not something that happens to any large degree over most flat ranges.</p><p></p><p>If you are shooting in the mountains or over/near valleys, you will have to use wind flags and learn through experience. The math is way too complicated because you have so many possible vectors.</p><p></p><p>For windage, both side and head/tail, the affect is treated as a single variable leading to a single adjustment. Quartering winds rising or falling or swirling would probably need a NASA engineer to guess at.</p><p></p><p>Best advice is to practise. Each cal/cartridge/bullet/barrel has its own special characteristics and real world shooting will give you more info then any computer modeling. Too many variables to compute. Plus the info inputed would not be complete or accurate for a different range.</p><p></p><p>This is not a cope out, just a fact. As a rule, we don't give crosswinds any vertical stringing component. Vertical stringing comes from head/tail winds, poor loads, poor recoil control, and /or boiling mirage.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 5691, member: 8947"] Oli, the only way that a crosswind can impose a vertical component is if the wind is flowing upwards (thermal) or downwards (wind shear). These are usually not something that happens to any large degree over most flat ranges. If you are shooting in the mountains or over/near valleys, you will have to use wind flags and learn through experience. The math is way too complicated because you have so many possible vectors. For windage, both side and head/tail, the affect is treated as a single variable leading to a single adjustment. Quartering winds rising or falling or swirling would probably need a NASA engineer to guess at. Best advice is to practise. Each cal/cartridge/bullet/barrel has its own special characteristics and real world shooting will give you more info then any computer modeling. Too many variables to compute. Plus the info inputed would not be complete or accurate for a different range. This is not a cope out, just a fact. As a rule, we don't give crosswinds any vertical stringing component. Vertical stringing comes from head/tail winds, poor loads, poor recoil control, and /or boiling mirage. Jerry [/QUOTE]
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Vertical drift from crosswinds
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