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Sudden Point Of Impact Changes During Springer Break-in.

Discussion in 'Technical' started by Sisuphos, Jun 28, 2020.

  1. Sisuphos

    Sisuphos Member

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    I changed the piston seal and spring on my air rifle a few weeks ago and have put about 700 pellets through the rifle so far. However I have found that every 150 shots or so I experience a 2-3 cm drop in the point of impact at 10 metres, and the change seems to come with no warning at all. I'm thinking that this is due to normal break-in of the metalic spring. My theory from seeing this effect is that changes the spring's properties happen in little 'leaps' rather than gradually over time. Is this something anyone else has maybe seen or am I on the wrong track?
     
  2. Dag

    Dag Pro Poster

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    I don't think any spring would change in little leaps apart from possibly a break, which yours has not.
    More like it is a sudden change in hold either through fatigue or some other reason, perhaps the odd tighter pellet?
    Jim
    ps Welcome to the forum!
     
    Sisuphos likes this.
  3. Tadpole

    Tadpole Super Moderator Staff Member Mod/Admin

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    @Sisuphos

    It’s helpful to have your location should there be a question to answer, click HERE then scroll down to edit your details …. ;)
     
  4. Andy D

    Andy D Engaging Member

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    I would have thought 700 pellets should be plenty enough for everything to be bedded in. Might be some as simple as needing to clean your barrel.
     
  5. Septic

    Septic Superbus et Vetera

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    What rifle is it?...
     
  6. Andy D

    Andy D Engaging Member

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    Oh, and if your spring guide is a bit too snug, that can upset things intermittently.
     
  7. Jimmypie

    Jimmypie AGF Leshiy rehoming service

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    Do you mean a sudden and then continuous POI shift by 2-3cm at 10mtrs ?

    if using optics I’d check for scope creep .

    if it’s a one off ,and you are confident in all other factors like hold , optic / iron alignment then more than likely just a rogue pellet .
     
    Harleybracken likes this.
  8. Septic

    Septic Superbus et Vetera

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    If it’s a break barrel, It’s probably not indexing correctly sometimes...
    That kind of POI deviation is exactly what you’d experience...
     
  9. hmangphilly

    hmangphilly Posting Addict

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    Did it shift before you changed the seal and spring ?...........why change them ?
    25 ish mm is a big drop at 10 m .

    So.
    You shoot on target for 150 shots , then you poi will drop ?
    Does it stay down there ? or will it return to previous poi after more shots or leaving the gun to rest ?
    How long between shots ?
    Have you crono numbers before and after the shift please ?

    Oh ,
    What rifle ?
    What seal ? ( originally and now )
    What spring? ( originally and now )
     
    Last edited: Jun 28, 2020
  10. Sisuphos

    Sisuphos Member

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    Norica Quick. It's a fixed barrel air rifle.
     
  11. Sisuphos

    Sisuphos Member

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    Yes, the downward shift is sudden and permanent. The rifle has a fixed barrel and I shoot using iron sights.
     
  12. Septic

    Septic Superbus et Vetera

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    I’d suggest that the vibration may be knocking your elevation out..
     
  13. Sisuphos

    Sisuphos Member

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    I was thinking a dirty barrel could be the issue too, but then again cleaning my barrel every 100-200 shots doesn't really appeal to me. My barrel needs a few shots to settle after a clean, which I see as wasted pellets compared to rezeroing. I have heard of some rifles going over well over 1000 pellets before settling.
     
  14. Jimmypie

    Jimmypie AGF Leshiy rehoming service

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    so after 300 shots it’s a 6cm drop ? Or does it return back to original POI on the next session , 150 shots in a single continuos session will warm things up and possibly affect the cycle .
     
  15. Sisuphos

    Sisuphos Member

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    The point of impact stays the same for 150 shots then falls and stays on the new point. I let the gun rest, then shoot some more to confirm the new point of impact then adjust the sights, shoots fine for a while the the drop happens again. The old seal was cracked and the spring was bent, threw away the packaging but they were from a good source, both for my rifle a Norica Quick fixed barrel.
    The most recent drop, yesterday, happened after I last shot the rifle 3 days before, I can't say for sure if that's true for the previous changes.
    No crono unfortunately, really would have been interesting to have those figures.
     
  16. hmangphilly

    hmangphilly Posting Addict

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    Interesting
    So if this has happened say 3 times , then your current poi at 10 m is 75mm lower than original ? The poi does not return to previous settings ? so if this continues ,at some point yu'll run out of sight adjustment ?

    I'll have a google of Norica Quick

    Mate , buy , beg ,steal, borrow a chrony
     
  17. Nickg

    Nickg Busy Member

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    Scope shifting I reckon
     
  18. Nickg

    Nickg Busy Member

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    Had a quick look gotta be the longest transfer port known to man !
     
  19. Septic

    Septic Superbus et Vetera

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    I think he’s using open sights..
     
  20. Jimmypie

    Jimmypie AGF Leshiy rehoming service

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    if they are dovetail , no reason why they aren’t shifting too .
     

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