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Over powered

Discussion in 'Anything Airgun Related' started by Welshdean, Mar 8, 2014.

  1. Welshdean

    Welshdean Well-Known Member

    Messages:
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    Location:
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    Im having a bit of an issue with my s410 classic pre anti tamper.

    To cut a long story short.....

    i went to to the guy and saw the rifle, put it through a chrono and it's was saying it was firing 28lbs, took it somewhere and realised that I didn't have my digital chrono setup properly. So the guy who I took it to used his digital chrono and saw that it was only at 15 lbs, still over but nowhere near what mine was saying. So he turned it down until it reached 11.3.

    i have recently changed my pellets and then again put it on the chrono last night and it said 23 lbs. I changed my pellets weight on the chrono before hand and I thought I done it right.

    however, I also used my new fill bottle yesterday and turned the tap to open it, and closed it when it reached the right pressure. Then disconnected it from the rifle before release the pressure screw thing. Could this be the problem it's over powered or have I just not set up my chrono properly.

    thanks
     
  2. muzzy76

    muzzy76 Busy Member

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    Location:
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    Sounds like you just haven't set the chrono up correctly. Double check and try again. Filling the rifle and not bleeding the hose before disconnecting wouldn't cause a power increase.
     
  3. mattyts

    mattyts Donator

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    Use someones shoot through chonograph,not a combro then do the calculations yourself.

    Also if your going to carry on removing the metal connection when its under 180 bar of pressure,sooner or later you are likely to injure yourself.
     
  4. Truckcab79

    Truckcab79 Busy Member

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    If you've got a combro, test it again with a silencer attached. If I have anything shorter on mine (such as my air-stripper), then it reads the muzzle blast not the pellet. My S400 reads 21ftlb without the silencer on.
     
  5. Welshdean

    Welshdean Well-Known Member

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    Thanks for the info guys, I've set it up correctly now and I'm running at 10.6 lb. is it worth turning it up so I'm getting around 11.5 ish, and what or where can I get a little star socket thing to undo the power screw thing
     
  6. mattyts

    mattyts Donator

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    Well,do you want or will you notice another 0.9 ftlb energy? is the screw a torx?
     
  7. Welshdean

    Welshdean Well-Known Member

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    Yes mate, it's a torx with a pin in the centre of it
     
  8. mattyts

    mattyts Donator

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    Hollow torx bit then.
     
  9. bhodge

    bhodge Posting Addict

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    Location:
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    Personally I would leave it alone mate, you're initial concern was that the gun was high-powered & hence illegal - now it's comfortably legal. Problem solved I would say!!
     
  10. SteveO

    SteveO Top Poster

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    Dean,

    If you are intent on turning it up a touch, I wouldn't take it over 11.4fpe, this should allow for any pellet out there being slightly more efficient that would take it over the limit.
     
  11. Welshdean

    Welshdean Well-Known Member

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    Thanks Steve , I'm currently using air arms diablo field 8.4 grain. If I set it with these to 11.4 like you said, it should be ok. What's the heaviest .177 pellets so I know if I'm ever going to go over
     
  12. mattyts

    mattyts Donator

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    The heaviest which are available easily are probably bisley mags but RWS brought out some new ones too which are also heavy.

    Also it's good to note that head size can effect power just as much as the weight of the pellet.
     
  13. Dels510

    Dels510 Active Member

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    Hi Dean
    I wouldn't turn it up much if at all mate,i'm assuming your using the usual 4.52 aa field for 10.6 ftlb.
    When i tried a 4.53 jsb (8.4 grn ) in my 510 it jumped from 10.7 to 11.4 ftlb.
     

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