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Wind effect on accuracy

Discussion in 'Anything Airgun Related' started by Pinpoint, Mar 22, 2012.

  1. Pinpoint

    Pinpoint Posting Addict

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    Been out tonight in what only could be described as a breeze and had been having issues grouping. This was a typical group that I was getting.


    33yards

    [​IMG]



    Later the wind dropped and so a quick 5 shots gave me this.


    33yards

    [​IMG]


    Those pellets are pretty much through the same hole, the tear of the paper makes it look worse than it is.


    Can a bit of wind really make this much difference? I was shooting .177 JSB Exact express out of a AA S400 shooting at 11.5ftlbs.
     
  2. Mart61

    Mart61 Pro Poster

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    I'm no expert but I think the results speak for themselves?
     
  3. Ianhw77k

    Ianhw77k Big Poster

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    I've had some strange results in slight winds, I swear sometimes when a wind is faster it doesn't affect it so much which gets me wondering if wind speed and wind power are different things, like BHP and Torque in a car engine:confused:
    Maybe air pressure or moisture density has a bearing on the torque or power of certain winds rather than just the speed itself, or maybe I'm just thinking too much again:eek:
     
  4. andy46

    andy46 Donator

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    they do say the .177 is more prone wind effecting them,but i was out the other day shooting with my .22 and i was really windy,about 15 to 20 mph and my pellets where just as bad as that,had to give them at least 2/3 mil dots to the right,and that was only at 25 yards,might of got the wind speed wrong,could well of been stronger.its hard to guess wind speed at the best of times.
     
  5. Dead eye kai

    Dead eye kai Busy Member

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    The wind does tend to affect .177 more. And you using express which is the lighter jsb. For a practical experiment place a ping pong ball next to a golf ball on a table. Blow the ping pong ball first. It doesn't need alot of puff to get it going. Now blow the heavier golf ball. Needs alot more puff to get it moving. It's the same with pellets. Although a .22 has more surface area and is travelling slower because it's heavier the wind needs to be stronger to push it off target.
     
  6. Dunkman

    Dunkman Posting Addict

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    Not sure of the .22 V .177 in the wind arguments. A.177 is lighter obviousely but also has a smaller cross section for the wind to act against and secondly, any deviation will be relative to speed of the projectile so a .177 traveling faster than a .22 has less time to deviate before it hits the target.

    Just my take on things and not a definitive answer obviousely
     
  7. Pinpoint

    Pinpoint Posting Addict

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    Every bone in my body told me that the smaller surface area and faster velocity/time in the air would mean it would be less effected than .22s but my .22 S400 that was shooting at 10ftlbs seemed less effected.

    The important thing for me is not just the change of POI but how much wider the grouping is. It shows that the wind was no blowing consistently yet I was not able to see these changes from my shooting position. It really wasnt that windy which concerns me as it is rarely still up here.
     
  8. dave ratz

    dave ratz Posting Addict

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    Did anyone notice variation on up & down as well as L/R due to wind, warmer weather changes drift alot, cant beat 2-3 hrs just plinking in different temps, sunny days-winter morns all change P.O.I MIGHT BE SLIGHT BUT THATS A KILL OR RUN AFTER THE B**GER even at your general hunting distance its worth an hour or two just to relieve yourself of that shot in that temp/wind, i do find over 25 yrds the differ in 1.77-.22 very noticable , i do favor .22 over 25+ as said my opion not techno....Ratz
     
  9. Pinpoint

    Pinpoint Posting Addict

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    Id agree with you. In any wind I wouldnt take a sub 25yard shot as I simply cant predict what the pellet will do. My target had around 10-15 pellets shot within 2 minutes and shows that sometimes it will hit in one area and another time it will be somewhere else. Its not as simple as just aim left/right.
     
  10. Ianhw77k

    Ianhw77k Big Poster

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    The downfall of the girlie calibre begins :popkorn::D:D:D
     
  11. Pinpoint

    Pinpoint Posting Addict

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    Highlighting the downfall of the girly sub 12ftlbs law more like.
     
  12. Pinpoint

    Pinpoint Posting Addict

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    Interesting theory, not thought about that before but makes perfect sense.
     
  13. dave ratz

    dave ratz Posting Addict

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    Last year some students wanted to film some shooting for a project for colledge so i had 4 students filming me shooting at various distances, it was only when the film was slowed that it got noticed that my holdover at 75+ yrds was going above the heatwave level and changeing flight deviant then again when reentering the wave again, targets not live incase sad posts,they must just catch the breeze hovering just above the haze,some days you have a 18 inch haze others 36 inch haze off a bi-pod low down who would look at that, wierd sience...Ratz
     
  14. amaser1

    amaser1 Donator

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    Nah, worst case scenario Ill just use bis mags thanks :p
     
  15. Pinpoint

    Pinpoint Posting Addict

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    That sounds like a good idea. I haven't tried Magnums yet buy my rifle seems so pellet fussy I doubt they'd be any good. Even JSB exacts are pretty average, it's only the lightweight Exact Express' that seem to group well.
     
  16. Ianhw77k

    Ianhw77k Big Poster

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    Glad it made sense to someone:eek:
     

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