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Advice Air Arms S400 Power Output

Discussion in 'Anything Airgun Related' started by zippo1973, Apr 1, 2014.

  1. zippo1973

    zippo1973 Donator

    Messages:
    321
    Likes Received:
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    Location:
    Kingswinford
    I have an S400 Classic that I have had from brand new in February. I recently checked the power output with 10 pellets shot through a chrono, and the readings seemed very inconsistent. They vary from 721 fps to 770 and 9.69 lb/ft and 11.07 lb/ft. I'm using Air Arms Diabolo Fields in .177 4.52 mm , the pellet weight is 8.4 grains. Does anyone have any ideas why the readings I have are so inconsistent?
    (BTW The rifle is only filled up to 170 bar and refilled when it gets to around 100 bar.)
    Many thanks
    Nick
     
  2. Sparkyjon

    Sparkyjon Engaging Member

    Messages:
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    Location:
    Neath , cimla
    Muppet answer first. Is the chrony battery good , and what chrony is it, is something interfering with the readings. After that I'd check for perishing seals, not gone yet but giving inconsistent air seals.
     
  3. mark112

    mark112 Engaging Member

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    Location:
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    Hi,

    My own Combro (if that's what you are using) is very sensitive position wise when used on my own .177 S400. The .22 is not anywhere like as fussy. If not EXACTLY right will vary wildly (+/-30 fps). My be worth the 4.5mm knitting needle alignment method!

    Mark
     
  4. zippo1973

    zippo1973 Donator

    Messages:
    321
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    Location:
    Kingswinford
    Thanks Mark, it is the Combro I'm using, only got it today and changed the batteries , I got an alignment tool with the chrono, however in retrospect my test wasn't particularly scientific. I'll have another go tomorrow.
    Cheers
    Nick
     
  5. Lee67

    Lee67 Posting Addict

    Messages:
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    Location:
    Emley Moor FTC
    I've had diff chrono readings from using a cheap chrono attached to end of barrel to using our club chrono...so try and test on a decent chrono first , u might be surprised!
     
  6. gracole

    gracole Donator

    Messages:
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    Location:
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    nick its a new gun mate still got grease on the hammer rail heres mine with polished rail out of the tin pellets 170 bar down to 110 bar
    [TABLE]
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    [TD="width: 64, align: right"]786[/TD]
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  7. zippo1973

    zippo1973 Donator

    Messages:
    321
    Likes Received:
    3
    Location:
    Kingswinford
    Cheers Gra, what chrono were you using?
     
  8. gracole

    gracole Donator

    Messages:
    574
    Likes Received:
    0
    Location:
    rowley
    combro i have checked it on the one at kinver and theres not much dif think you will find the gun will settle the more you use it. tez's hw100 was like that from new he melted the grease out with an hair dryer your gun is still under waranty so to early to have the anti-tamper off or i could have sorted it for you atb
     
  9. Hodg

    Hodg Donator

    Messages:
    872
    Likes Received:
    0
    Location:
    Black Country
    What he said.
    Atb
     
  10. tintin

    tintin Engaging Member

    Messages:
    325
    Likes Received:
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    Location:
    South of Cirencester
    It normally takes 2 (sometimes 3) tins of pellets to bed everything in. If you have already fired that number, you could have dirt/grit on the hammer rail, you may have lost the 'o' ring where the pellet enters the barrel, you may have lost the 'o' ring in the breech block.
    Unfortunately your AA is fitted with anti tamper.
    This is a warranty issue. Return it (either via your dealer) directly to Air Arms.
    Good luck.
     

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