Wind adjustment

Discussion in 'General Airgun Chat' started by Sundance, Nov 16, 2014.

  1. Sundance

    Sundance Bush Cavity

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    Can anyone tell me please...

    Using JSB exact 8.44 at a target at 50M

    With a 10 mph wind at 90 degrees to line of sight

    At 780 fps at the muzzle

    How far off will the pellet strike laterally from my point of aim?

    Cheers
     
  2. Conor

    Conor Never been banned from sales Staff Member

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    As far as the wind had carried it
     
  3. Neil

    Neil MFTA Winter League Champion 2011 and winner of som

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    Haven't got a clue, shoot in those conditions and measure the movement.
     
  4. Lee67

    Lee67 Dink ! ...****'

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    Practice in those conditions....then practice some more...and more and more;)
     
  5. Sundance

    Sundance Bush Cavity

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    Anyone with anything helpful and constructive to add?
     
  6. Conor

    Conor Never been banned from sales Staff Member

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    Go out and test it out
    Or
    Use Chairgun

    Or
    Give it 3 discs
     
  7. Sundance

    Sundance Bush Cavity

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    Thanks Connor.
    Do you mean 3x 40mm discs?

    Do I add 3 extra discs as well as the target disc?

    Don't have Chairgun but would be interested to hear from anyone who does
     
  8. Conor

    Conor Never been banned from sales Staff Member

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    Always aim from centre, make allowances from centre.

    As Neil says you get an idea of wind strength and drift on the day. I don't know a human being on planet earth who could accurately tell the difference in 9mph and 10mph

    As Lee has said get out and practice, buildiup a memory bank of what a particular wind and how it feels and its direction in relation to the target can and does move your pellet
     
  9. Lee67

    Lee67 Dink ! ...****'

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    Then practice some more :D...top shooters have learnt the wind well, this comes with shooting in Such conditions loads
     
  10. skires

    skires Well-Known Member

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    6.8 inches
     
    Last edited: Nov 17, 2014
  11. Sundance

    Sundance Bush Cavity

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    Thanks guys, so answer is 6.8 inches..

    Is that at a given temperature ?

    What does Chairgun say for 25 meters? I'm guessing it isn't half....
     
  12. Brian.Samson

    Brian.Samson Allowed in Sales Staff Member

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    More like a 1/4 - but why not have some virtual practice on my little wind game.

    http://competitionshooter.co.uk/windeeze/

    Have a go at the York winter league event from last season - it'll teach you how you need to change your holdoff for wind at different distances and different directions of wind.

    The calculations used in the game use the same ballistics calculations as Chairgun but it's more fun than just looking at a table of numbers.
     
  13. Sundance

    Sundance Bush Cavity

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    Hi Brian

    It was using and really enjoying your Game that prompted the question.

    Was looking for some baseline balistic figures to guide as extra information.


    I`ve developed a liking for your virtual mil dot reticles....unfortunately my Big Nikko has much tighter dots....

    It`s a brilliant tool...thanks for developing and sharing it.

    Simon
     
  14. dave croucher

    dave croucher ÃŒch bin ein Meister Man

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    Get a 2002 and pump it down the midle
     
  15. TOOL

    TOOL Independent FT Pumper

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    Today I shot in a 6 - 8 mph wind using 7.9 JSB Express, the mega batch that Wagger paid a fortune for, these slugs are capable of slotting one down an Otters urethra at 55 yards.

    Anyway .......................

    In these conditions I was observing two lines and one dot through my scope
     
  16. luddite

    luddite I Love HFT

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    I shot in the same conditions Scott and I observed a moose, a dragon, and a phoenix though my scope. :p

    I was shooting at Emley.
     
  17. NJR 100

    NJR 100 Because I`m AWESIME !!

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    1 mil dot unless lubed
     
  18. rich

    rich Active Member

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    If you visit my club website www.shebbearshooters.co.uk you can download for free an Excel spreadsheet to play with. Click on the USEFUL STUFF tab and then scroll down.
     
  19. ome177

    ome177 New Member

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    With my s200 it would have been approximately 1.5 mildots.

    My new Tx200 is only about 1 mildot however.
     
    Last edited: Nov 17, 2014

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