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Daystate POI change after refill

Discussion in 'Anything Airgun Related' started by Shooter22, Jul 2, 2012.

  1. Shooter22

    Shooter22 Donator

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    Hi all,

    After zeroing my scope at my chosen range i put the gun away and left it for a week or so.
    I then refilled it to the desired fill pressure, 200 bar, only to find that my zero had dropped about an inch to the left and down.
    Can anyone give me some idea what may have caused this.

    Thanks

    Shooter
     
  2. gasman

    gasman Ex-Head of sales smartfit uk, IQ -8

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    what was the pressure at when you zerod it before?
     
  3. mick 1986

    mick 1986 Keyboard Hero

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    If its regulated and giving a constant ME output, I would suspect one of 3 things; 1) the rifle or scope has taken a knock from being out away until taking it back out; 2) clipping the silencer or 3) dodgy pellets.
     
  4. Darren Petts

    Darren Petts Temporarily Alive

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    Whilst it's possible that the act of filling can cause poi shift it's far more likely that either the scope or barrel has taken a whack or the scope or fig 8 barrel band aren't tight enough.
     
  5. Shooter22

    Shooter22 Donator

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    Hi,

    The fill pressure was 160 bar so it was still on the reg. the sweet spot is 197 to 134 bar.
    I was using the same tin of pellets that i did before i laid the gun away, the grouping is fine it is just the point of impact that has changed.
    It is not the first time this as happened after a refill either so i dont think the scope is the problem.
    I thought the air cylinders on daystates are quite thick skinned or do they expand and contract under different pressure.
    if so i am thinking that it could have something to do with that.

    Regards

    Shooter
     
  6. bobbie1

    bobbie1 Busy Member

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    When you fill a un-regulated gun up you get a power curve , it starts of with lower power as the hammer try's to overcome the higher pressure as it knocks the valve open giving a lower shot , as it uses air the pressure drops and power goes up as it reaches the high spot in the power curve,
    if you had filled your gun then set the sight you would have seen it shoot higher as it overcome the pressure ,
    hope this makes sense,
     
  7. Shooter22

    Shooter22 Donator

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    Hi,

    Can you elaborate when you say that the act of filling a pcp can cause point of impact changes.

    Thanks

     
  8. Darren Petts

    Darren Petts Temporarily Alive

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    If it is fill related the only way to check I can think of will involve clamping a laser to the end of the barrel or silencer and zeroing it to the scope then filling. If it's the fill causing expansion issues the laser will move off it's setting after a fill.
     
  9. rick r

    rick r Engaging Member

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    Check that the cylinder isn't incontact with the stock, take a £5 note and see if will side down between the cylinder and stock. You could also slacken the stock bolt off to finger tight and see if that makes a difference.
     
  10. Shooter22

    Shooter22 Donator

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    Ok thanks, will give it a try.

    regards

    Shooter

     

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