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Problem with PCP

Discussion in 'Anything Airgun Related' started by BAM100, Apr 25, 2014.

  1. BAM100

    BAM100 Member

    Messages:
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    Location:
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    Hi, I think my BSA T-10 Scorpion (sub 12) may be down on power. I am aware that my dive bottle needs refilling, as it only charges the gun up to 180psi instead of the maximum pressure of 190 that I usually charge it to. I thought everything was ok until when I was out hunting this morning, and I got a head shot on a rabbit at about 20m, and I'm pretty sure it was a good head shot, but the rabbit just flinched a little and ran away. That must have been either the second or third shot I had fired since charging the gun yesterday, so surely even after being charged to 180psi instead of 190 it should still have been full power at that point?

    Are there any common problems that would result in this? I seem to remember that we had a similar problem with it well over a year ago, but I can't remember exactly what was wrong. Something to do with O-rings possibly?:confused:

    Having spent quite a lot of money on fixing this gun in the past, we're considering selling it back to the shop and buying a different gun, maybe a BSA R10 or something like that?
     
  2. Chinnymonster81

    Chinnymonster81 Busy Member

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    Location:
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    The only way to know if its down on power is with a chrono. Start there it may be that you shot the luckiest rabbit on planet. If you don't have one, buy a combro as they are invaluable. And the 50 quid it costs will be worth it in the long run. If you find it is down on power then you can investigate further otherwise its all guess work. After all it could be a seal or it could be the valve or a weak hammer spring or something else entirely. Best of luck and hope it was lucky rabbit.
     
  3. r10hunter

    r10hunter Honorary Member

    Messages:
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    Location:
    lincoln
    As above you really need a chrono.
    But once you know your gun is working correctly it is always worth noting down your pellet drop at 60 yards. If you ever suspect you are down on power while out shooting it is a simple matter to shoot a target and see if you have a lot more pellet drop at long range. You can use this method even at night.
    You must be seriously down on power not to have killed the rabbit at 20 yards. Are you sure you did not have a flier for some reason or no pellet in the gun. Your gun should still be well in its range of full power operation.
    Your first port of call has got to be buy or borrow a chrono.
    Cheers Andy
     
    Last edited: Apr 25, 2014
  4. trumpetier

    trumpetier Pro Poster

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    Location:
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    Yep get it chronoed better still as suggested get your own combro. In relation to the cost any decent airgun combo there cost is minamal....having access to one is invaluable. I can't imagine using any of my rifles without knowing what power they are producing....it gives you more confidence in your rifle and ensures you are the right side of the law....always.
     
  5. secretagentmole

    secretagentmole Low down, dirty and quiet...

    Messages:
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    Location:
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    As above. By a Combro!

    http://www.chronoscopes.com


    Then try a few shots and check the grouping. Could just be your barrel needs a clean or you are using the wrong ammunition! I do not like JSB pellets and find I get many fliers with Air Ams, JSB or any other pellet made by JSB (they damage far too easily for my liking).

    BSA pcp rifles in my experience (Ultra, Scorpion, Super 10), like Crosman Premier Ultra Magnum pellets!
     
    Last edited: Apr 25, 2014
  6. Fubbytucker

    Fubbytucker Busy Member

    Messages:
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    Location:
    Rotherham
    Where in England are you based, it's a big place!
    A local member might offer to chrono it for you.
     
  7. Tripleteer

    Tripleteer Donator

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    Location:
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    Get it Chrono'd as everyone says, if you say whereabouts in ENGLAND you are there may be someone close at hand who can help you out!!
     
  8. Jackroadkill

    Jackroadkill Donator

    Messages:
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    Location:
    Drenewydd, Powys, Cymru
    180 psi will not be helping; 180 bar might. If you're only filling to 180 psi you'll be 15 times lower on cylinder pressure than you should be.
     
  9. BAM100

    BAM100 Member

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    Location:
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    Thanks for the advice everyone. I'm in East Yorkshire, near Hornsea if there's anyone in the area that would let me borrow a chrono? :) I'm pretty sure I actually hit the rabbit, as I heard a thud as it hit its skull. Unless something weird happened and I hit something else... I use airarms diabolo field pellets, which do seem to bend incredibly easily, I think I'll try some different ones once I run out. Oh, and I meant to say 180 bar, I could almost get to 180 psi with my bike pump lol. :p I've had to resort to the trusty springer for now until this gets sorted out, and I don't think the racehorse in the field appreciates it.
     
  10. Akita177

    Akita177 The Absolute State of Britian podcast

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    Location:
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    depending on how your gun/scope/zero is set up especialy if its a 22 you could have easily have gone over his head at 20m and hit something else?
    As everyone has said a full shot string over the chrono is needed to check power and consistency.
     
    Last edited: Apr 26, 2014

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