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BSA very low power

Discussion in 'Anything Airgun Related' started by chris500, Jan 28, 2014.

  1. chris500

    chris500 Member

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    Hi, I have just bought a second hand (2 years old) Ultra multishot .22, beautiful gun and condition but have used a chrono on it today and had some strange results.

    From a 200 bar fill I shot 40 pellets all at between 7.5ft/lb & 8.5ft/lb, from 40 to 70 shots it gradually increased in power peaking at 10.41ft/lb at about 70 shots. then dropped of to 9.04ft/lb after 80+ shots.

    Any advice on what the issue may be?

    Thanks

    Chris
     
  2. mattyts

    mattyts Donator

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    Try filling lower so your at the 10.4 ftlb,that will be the sweet spot on the curve. (never seen a gun vary that much though)
     
  3. chris500

    chris500 Member

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    I thought that but wondered if there was something keeping it so far from the 12ft/lb limit?
     
  4. mattyts

    mattyts Donator

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    10.41 isn't so far from the 12 limit,it's a little low but I wouldn't be bothered about it
     
  5. chris500

    chris500 Member

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    Ok, but that's after about 70 shots, I thought that they were only supposed to do 40 shots at full power. This takes 70 shots to get to almost full power! The first 40 shots are at 2/3 power
     
  6. mattyts

    mattyts Donator

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    70 shots? :O My ultra does about 60 regulated,did 30 as standard...has it been modified?
     
  7. chris500

    chris500 Member

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    No it's bog standard afaik..!
     
  8. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Bit strange, my ultra does 75 regulated in .22.

    Are you shooting from full all the way to empty. Try filling to 180, or even 170 and do a string from there:)
     
  9. mattyts

    mattyts Donator

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    Fill to 200,dry fire 40 shots then put the gun on the bottle but take note of the pressure (This,from the data you've given us sounds like your sweet spot) and then fill it to there every time...then you should be firing consistent 10.4 FTLB shots.
     
  10. clbarclay

    clbarclay Engaging Member

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    My .22 ultra has a similar power curve. With a bit of testing I now normally fill it to 150 bar for 20 very consistent shots or about 170 bar for 40 with less than 1 ft.lb variation.

    Check the condition of the O ring on the pellet probe. Even slight damage will cause the power to drop. Also what ammunition are you using? With Accupells mine peaked at 10.9 ft.lb, but just changing to RWS superfields or AA fields raises the peak power to just over 11.5 ft.lbs. Despite the weight difference the pellet trajectories are very similar.
     
    Last edited: Jan 29, 2014
  11. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    Try changng pellets too, might be you are not using the best pellet for the gun, try Crosman Premier Ultra Magnums as an alternative!
     
  12. chris500

    chris500 Member

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    All sorted guys thanks, the adjusting ring in the end cap adjuster had wound it's self right back in to the end cap releasing the weight off the spring. Adjusted it back so I am now getting about 45 shots at 11.55 ft/lb after which it tapers off quite rapidly as you would expect!
    It's a different rifle now, very accurate and very consistent for 45 shots from a 200 bar fill.
     
  13. 1961nuffield

    1961nuffield Honorary Member

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    Try some loctite on it now its right, you wouldn't want it moving and altering the power again.

    John
     
  14. chris500

    chris500 Member

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    Already done..
     

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