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Long Range Wind Drift.; Which Winds Have the Greatest Effect?

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  #1  
Unread 01-29-2006, 11:31 PM
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Long Range Wind Drift.; Which Winds Have the Greatest Effect?

This subject is often discussed among people who shoot at long range. It's about what crosswinds across the line of fire has the greatest effect on bullet drift; closest to the shooter, halfway or closest to the target. So let's read about what folks think. Here's the situation.....

The target is 900 yards away. And there's three 10 mph 300-yard crosswind situations; each with the wind coming straight from the left or from 9-o'clock.

First situation; an uprange 9-o'clock wind blowing across the line of fire between the muzzle and 300 yards. There is no wind between 300 yards and 900 yards.

Second situation; a midrange 9-o'clock wind blowing across the line of fire between 300 and 600 yards. There is no wind between the muzzle and 300 yards and between 600 and 900 yards.

Third situation; a downrange 9-o'clock wind blowing across the line of fire between 600 and 900 yards. There is no wind between the muzzle and 600 yards.

There's three situations where the bullet goes through a 10 mph crosswind for 300 yards enroute to the 900-yard target. Which crosswind causes the greatest bullet drift at 900 yards; uprange (close or near wind), midrange (halfway) or downrange (furthest or far wind)?
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  •   #2  
    Unread 01-29-2006, 11:51 PM
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    Re: Long Range Wind Drift.; Which Winds Have the Greatest Effect?



    Thats how I understand it.
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      #3  
    Unread 01-30-2006, 08:55 AM
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    Re: Long Range Wind Drift.; Which Winds Have the Greatest Effect?

    4ky -- nice illustration...equal winds...closer they are to the the muzzle = more displacement on paper.

    JB
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    Unread 01-30-2006, 10:41 AM
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    Re: Long Range Wind Drift.; Which Winds Have the Greatest Effect?

    Thank you. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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      #5  
    Unread 01-30-2006, 11:21 AM
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    Re: Long Range Wind Drift.; Which Winds Have the Greatest Effect?

    While cross winds are the main issue, never forget updrafts and down drafts. If you shoot in an area with these you will learn quickly that they can leave you scratching your head in a big way!!

    Where I shoot LR, Lot of it is from one rim of a canyon to another. Up and down drafts are always an issue and can result in misses of several feet by these forces alone.

    Keep them in mind as well.

    Kirby Allen(50)
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      #6  
    Unread 01-30-2006, 07:03 PM
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    Re: Long Range Wind Drift.; Which Winds Have the Greatest Effect?

    I agree with the previous posters in that the wind at the muzzle would have the most impact on bullet deflection. However, the bullet, while traveling from 600-900yds has the longest time of flight and should, therefore, be more affected by the prevailing wind then the bullet during periods of shorter flight time. [img]/ubbthreads/images/graemlins/crazy.gif[/img] [img]/ubbthreads/images/graemlins/wink.gif[/img] [img]/ubbthreads/images/graemlins/smirk.gif[/img] [img]/ubbthreads/images/graemlins/tongue.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]
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    Unread 01-30-2006, 07:09 PM
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    Re: Long Range Wind Drift.; Which Winds Have the Greatest Effect?

    Hair splitter. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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