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Wind at your back and ballistics

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Unread 11-10-2006, 10:09 PM
Silver Member
Join Date: Oct 2006
Location: Memphis, TN
Posts: 117
Wind at your back and ballistics

I have seen lots of data about crosswinds and the effects on bullets. What if the wind is blowing from directly behind you. I was shooting a 25-06 rem. today with a 20 mph wind I shot 3 shot groups at 100, 200, and 300 yards.
100 was 4" high (normally 2") 200 was 4 inches high, and 300 was 3" low. Thats with a 120 gr factory winchester load. Something doesnt seem right. Just out of curiousity what about if its blowing in your face?
I just know enough about long range shooting to kno that I dont know sh*t about long range shooting!
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Unread 11-11-2006, 07:42 AM
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Join Date: Dec 2004
Location: Black Hills,South Dakota
Posts: 669
Re: Wind at your back and ballistics

Definately not the wind.A 6 or 12 oclock wind wont produce that amount of change at that yardage.Theorectically a perfectly horizontal 6 or 12 oclock wind wont cause any deviation,but of course theres no such thing as a perfectly horizontal wind.There will be up and down drafts,but to produce a 2" higher zero at 100 yds the wind would have to be coming straight out of the ground. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Unread 11-11-2006, 01:11 PM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,848
Re: Wind at your back and ballistics

Were you shooting in an area that was not flat??

A tail wind that comes down on your shooting position will cause down drafts and lower shot placement.

A tail wind that runs up a hill to your target can cause updrafting that will cause your bullets to hit high.

If your shooting over small hills at midrange you can also see some minor updrafting over these humps as well and cause slight vertical impact increases.

Up and down drafts can raise all sorts of issues so unless your shooting over a perfectly flat range, you can see some effect on target from a tail wind. Generally at 100 yards this is not a concern so if your jumping 2" at 100 yards I would say there is something mechanical to look into or you are holding your rifle in a different manor then before.

What rifle are you shooting, brand and style?

Kirby Allen(50)
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

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Unread 11-12-2006, 05:34 AM
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Join Date: Jan 2002
Location: Armagh, PA
Posts: 290
Re: Wind at your back and ballistics

Did you have a bipod removed or installed since you last zeroed?
Dan B.
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