HW100 POI Change in Cold Weather

Discussion in 'Hunter (HFT) & Field Target (FT)' started by JJ, Dec 19, 2012.

  1. JJ

    JJ Member

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    Hi All,
    This is my first Winter League season so I've only just experienced my first POI drop when the temperature hit 0 degrees. So I just wondered if there are any other HW100 shooters who experience this and if so how many different settings do you have. Currently I have turret settings for 0C and 7C. How many more temperature setting am I likely to need?
    All the best
    J.J.
    :)
     
  2. AndyIoW

    AndyIoW Member

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    It does seem to be a thing that happens to just about all when the weather gets cold it seems.

    RobF has a thread about this sort of thing going here might have some useful information.

    As a simple summary it does seem the cold the temperature the air density increases thus the drag on the pellet is more. For me I have always added 5yd to my turret in cold weather (freezing or below) and has worked quite well for me.
     
  3. JJ

    JJ Member

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    Thanks Andy, I'll have a read.
    Cheers
    J.J.
     
  4. JJ

    JJ Member

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    Hi Andy,
    That link isn't working. Can you point me in the right direction again please?
    Cheers
    J.J.
     
  5. AndyIoW

    AndyIoW Member

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  6. JJ

    JJ Member

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  7. Conor

    Conor Never been banned from sales Staff Member

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    Don't read the kestrel thread unless you want your brain to hurt real bad!
     
  8. blue dragon

    blue dragon Member

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    i must agree to a certain point this my first winter with the hw100 and on two cold weekends my first 5 or 6 shoots seem to be on the low side
    atb steve
     
  9. fatwelshboy

    fatwelshboy Member

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    The HW100 can have a lot of thick grease on the hammer/shuttle. I cleaned this grease away on mine and used Dri-Slide instead. It would still shift a little with the cold but nothing like it did with the standard grease. Something like this thread on the WOC
     
  10. RobF

    RobF Administrator Staff Member

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    Just to add... the main issue with the rig seems to have been stock warping... the kestrel was effectively telling me what the stock was doing in response to heat/humidity. Floating the stock well clear of the air cylinder seems to have resolved the issue. So far since i've seen no changes in POI
     
  11. Adam

    Adam Active Member

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    ^^^ This

    Before I degreased, my HW100 would shift from 10 ft.lbs at zero degrees to near limit on a hot day.
    I chronoed it in the cold, then at home when the action had warmed up every 3 degrees I chronoed it again.

    Then I stuck a temp strip to the action and actually made up a table with a different set of clicks for every 3 degree band! :eek:
     
  12. craigtodd1968

    craigtodd1968 Member

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    I use a Ev2 at the momment but i am going over to Steyr, i have mounted a big nikko on top .

    I expect with both of these guns that i will get some degree of change with the temprature.
    This is mainley due to the air density and the cold efecting the gun, more so the air density
    the way i deal wioth this by getting the gun out and leaving it to aclimatize to its outside
    enviroment.

    I then check my 50Yrd aim point if i find this to have changed i simply remove turret and re sit at the
    right clicks to get me hitting the right spot,

    These shifts only seem to happen at certain tempratures say below 10 deg ande then again at 4 deg.
    The reason i use 50 yards is two fold most long range targets are set around that distance and also because
    as the targets get closer adjustments for the clicks decrease,
     
  13. rickysdaystate

    rickysdaystate Make Every Shot Count

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    i had a hw100 that moved abit in the cold, i later got a BTAS HW100 and dont seem to have that problem anymore :)
     
  14. D Martin

    D Martin Non member

    Agreed, I did this with mine and it moved very little summer or winter

    Dave
     
  15. Tone

    Tone Member

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    This I found very useful when I had my HW100: http://www.youtube.com/watch?v=7qlyFjPNYgY

    Once I had degreased it and then gave it a covering of light oil it made a big difference to its performance in hot and cold weather.
     
  16. JJ

    JJ Member

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    Thanks for that, I would have never thought of that!
    I'm going to degrease mine right now.
    All the best
    J.J.
     

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