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Hw 77 Pellet Drop ?

Discussion in 'Anything Airgun Related' started by Tyler durdon, Mar 16, 2019 at 5:29 PM.

  1. Tyler durdon

    Tyler durdon Engaging Member

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    ive bought my hw77 177 about two months ago .cracking rifle.i set zero at 30m on the range it's got a hawk vantage 3-9x40 ao .it's done about 800 pellets jsb 8.4 .
    Last few trips to the range I've noticed now I'm holding under 1 mill dot at 30 ,bang on at 41 but only around half a mill dot over at 50 and 1 mill at 55 m I use only x6 at this range .
    Does this sound normal? Or has power gone up ? Or maybe just a good barrel
     
  2. pjgtech

    pjgtech Big Poster

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    Scope could have moved slightly?
    zero might have shifted slightly?
    different pellets?
    Different hold?
    Different temp?
    Barrel could be bedding in.
    :thumb:
     
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  3. Tinbum

    Tinbum Delusions of adequacy

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    Check it over a chrono regularly, that will tell you all you need to know
     
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  4. Tyler durdon

    Tyler durdon Engaging Member

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    Yes mate I suppose there are many variables to take into account.im waiting for a chrono to arrive .only got a combro at the moment right faff on a 77 when new i cobbled a way to mount it it was around 11.4 then
     
  5. timmytree

    timmytree Keyboard Hero

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    Certainly you need to chrono it but why didn't you reset the zero?
     
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  6. mikeyhall1

    mikeyhall1 2018 Forum Nice Guy

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    Exactly this^^^
     
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  7. Tyler durdon

    Tyler durdon Engaging Member

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    Yes fair point that's the next thing I'll do . The thing that was puzzling me was the lack of pellet drop at over 50 m . But if that's about right then great . Thats why I like the forum as I can learn from members
     
  8. BallisticBill

    BallisticBill Busy Member

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    Here are a couple of trajectories: 775fps/11.25ft lb and 730fps/10.0ft lb. I'm guessing scope height at 40mm assuming medium mounts.

    HW97-10.0ft lb.png HW97-11.25ft lb.png

    I can't get anything close to your 30yd hold under but the other intersects are fairly close at 10ft lb.

    Edit: I used yds not m but it won't make that much difference.
     
    Last edited: Mar 16, 2019 at 6:37 PM
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  9. Tyler durdon

    Tyler durdon Engaging Member

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    That's a bit over my head mate
     
  10. timmytree

    timmytree Keyboard Hero

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    Reset at 30metre zero and you have 1.5 mildots at 50 metres?
    Like Ballistic Bill I work in yards (but pellets in mm!) but those figures don't seem far off my own. I've just checked my Prosport chart, 1.5 mildots on 6X is 61 yards with a zero of 35 yards.
     
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  11. Tyler durdon

    Tyler durdon Engaging Member

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    Thank you I'll do that next week . And thanks for the advise men
     
  12. BallisticBill

    BallisticBill Busy Member

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    Forget the earlier pics. Here are two new ones. Just look at the tables at the left. They show the mil dots at 5m intervals.
    HW97-11.4ft lb.png HW97-7.45ft lb.png
    If your 30m and 41m POI are correct you are getting only 7.45ft lb. If your 41m, 50m and 55m are correct you are getting 11.4ft lb.
    But somewhere you are making an error because its impossible to get all 4 POIs as you listed unless your scope is moving between shots or you are getting massive power variation. If the gun is giving 11.4ft lb you would get near enough half mil dot hold under at 30m and the others as you listed.
     
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  13. Tyler durdon

    Tyler durdon Engaging Member

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    Time for a recheck then thanks a lot
     
  14. BallisticBill

    BallisticBill Busy Member

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    If you tell me your scope height I can post an intercept diagram like this:

    HW77-11.4ft lb.png

    This is a half-mil dot reticle at scope height 43mm zeroed at 30m and velocity 780fps/11.4ft lb
     
  15. Tyler durdon

    Tyler durdon Engaging Member

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    ok that's great good man thanks
     
  16. Tyler durdon

    Tyler durdon Engaging Member

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    Yes indeed an error on my part
    Just done a 10 shot test on chrono
    Low of 767
    High of 772
    Average of 11.094
    My scope is mill dot not half
    And indeed 43mm height
    Any help bill greatly appreciated
     
  17. GPConway

    GPConway Engaging Member

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    Clearly, the scope has been 're-adjusted' somehow. Loose mounts? Loose stock screws? Inquisitive child?

    This, notwithstanding the assumptions we've made, is what you've got now (your data circled in red):
    Screenshot 2019-03-17 at 16.50.49.png
    ScopeLabel_1.png
    ... compared to what you'll have if you re-zero back to 30m again.
    Screenshot 2019-03-17 at 16.54.02.png
    ScopeLabel_4.png

    Hope this helps.

    George
     
    Last edited: Mar 17, 2019 at 4:47 PM
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  18. BallisticBill

    BallisticBill Busy Member

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    You can get better range intervals against your mil dots if you change magnification, for example 7.2x

    HW77-11.1ft lb.png
     
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  19. Tyler durdon

    Tyler durdon Engaging Member

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    Bill and George that's great thanks so much for helping ,great effort thanks for taking the time this will help me no end .
     
  20. Tyler durdon

    Tyler durdon Engaging Member

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    Stock screws were loose !
     

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