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An Eye Opener

Discussion in 'Anything Airgun Related' started by WhyteCat, Feb 15, 2020.

  1. WhyteCat

    WhyteCat Engaging Member

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    Last week, through my AA S400 I tested 3 pellets - AA Fields weight 8.4gr, AA Express weight 7.87gr & JSB RS weight 7.33gr.

    The ft lbs were 10.85, 10.84 & 10.62 respectively.

    Today I tested JSB heavies @ 10.34 grains (tin weight) & the ft lbs was 11.92 !!

    Now that surprised me - ran the test again & the same, that’s a real eye opener.

    So WOW for the ft lbs & OH NO is the rifle a bit hot to trot ? - the question now is, is there a pellet out there that would give me even more ft lbs ??? Not that I want it !
     
    Blue BSA, Blackmax and Redcap 114 like this.
  2. Figgy

    Figgy Posting Addict

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    Can you measure the actual head sizes of the heavy pellets compared to the others?
    Try cleaning your barrel too.
    Smaller heads go quicker.
     
    Blue BSA likes this.
  3. Barry J

    Barry J Busy Member

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    Yes! QYS streamline. It put my s400 Classic way over, just over 11 with Exacts and 12.4 with streamlines, that was tested on 3 different Chronos. I actually rang AA and asked to speak to a tech regarding this and his technical answer was ‘just don’t use them if they are putting you over’, very technical answer that!
     
  4. sagalout

    sagalout What a plinker!

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    I always test with Bisley Magnums 10.65 as well as JSB Heavy and this week I got a surprise with JSB Monster 13.34 there is also a JSB Beast 16.2
     
    Blue BSA and Blackmax like this.
  5. Figgy

    Figgy Posting Addict

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    Worth checking will all heavy and light pellets the police can use whatever they want so long as it can be bought.
    Only have to buy a tin of 4.5 or heads smaller than this and your going to catch some out.

    Gets silly as a new pellet could come out be hopelessly inaccurate never to get used in mainstream shooting but fly fast and push guns over and lots could be unwittingly caught out.
    A standard should be in place with one pellet used for power testing and setting a gun up.
     
  6. Chouchin66

    Chouchin66 Posting Addict

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    The 10.34 JSB has a B.C. of .030- .031, anything w/ higher B.C. could quite probably up the ante. 8.44 B.C. only .021....
     
  7. WhyteCat

    WhyteCat Engaging Member

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    I always get 4.52 as rightly or wrongly presume the tighter the fit the more efficient through the barrel - correct me if I’m wrong.

    Yes just what is the test ??

    Barry J - what are the weight of the streamlines ?

    Sagalout - have you the test result of the monsters & beasts ?

    Cheers
     
  8. Chouchin66

    Chouchin66 Posting Addict

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    Pellet head only needs to just " kiss" the lands, the skirt obdurates to make a proper seal... A tight head = more friction / possibly less power.

    .
     
    BallisticBill and Figgy like this.
  9. Figgy

    Figgy Posting Addict

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    As above friction is your enemy, less friction more speed and power. The skirt is the air seal and also imparts spin from the rifling. Head only needs to touch.
    Look at the QYS pellets with small heads, people are finding them accurate. Probably faster too.
     
  10. John Entwistle

    John Entwistle Busy Member

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    The skirt looks to seal at a tighter angle on the QYS ( to my aged eyes ) thar might be why they fly so well less friction but still a good seal
     
  11. Barry J

    Barry J Busy Member

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    QYS streamline are 9.56 and 4.49mm, they are so accurate in my s400 I’ve turned the power down to 11.6 when using them, if I ever have to go back to jsbs or something else I’ll just turn it up.
     
  12. Figgy

    Figgy Posting Addict

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    You will be over the limit with the QYS or a loose heavy pellet.
     
    Last edited: Feb 16, 2020
  13. Chouchin66

    Chouchin66 Posting Addict

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    Shooting the smallest head size, that will still be graved by the rifling will be generally be most efficient, just enough contact to prevent yaw, in the barrel ... Thus going through the choke, askew... Compromising accuracy.

    .
     
    Figgy likes this.
  14. Figgy

    Figgy Posting Addict

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    Chouch we could have a pellet that falls into the breech yet gets its head spun by the choke.

    I now check buy pushing a pellet through the barrel and feel for how tight they are.
     
    Chouchin66 likes this.
  15. Barry J

    Barry J Busy Member

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    almost certainly! When I had the chat with the “AA engineer” and he told me not to use QYS I suggested to him that they are freely available therefore you are selling guns that will be over the UK limit, I also asked him what pellet they use to test their guns, he said he couldn’t tell me as it’s a secret and they don’t test with pellets anyway........ at that point I hung up..:facepalm:
     
    Wewekokowe likes this.
  16. sagalout

    sagalout What a plinker!

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    The Beast was ok, around the same as the Heavy at mid 11's, the Monster was a good 11.9+ and that's all I've got to say about that :eek:
     
    WhyteCat and Figgy like this.
  17. Figgy

    Figgy Posting Addict

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    What a right tit.
    I been thinking a standardized BB of exactly 4.5mm & 8.1grains be used for power testing for legal purposes, set to say 11.5fpe. if this was the case we would all be much safer as we know variables in pellets is a nightmare. If a pellets did creep over it wouldn't be by much to make much difference or the over all the time.

    @sagalout we know what mean 11.9 + I've been there in testing. As I guess we all have.
     
    Last edited: Feb 16, 2020
  18. edtwozeronine

    edtwozeronine Donator

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    Never thought to test over the chrono with diffo pellets, the only time I use different ones is when I'm looking for my go-to pellet for tight groups. I think they're 15.9 grain the .22 RWS Superfields and they come out around 11.4 ft/lb very similar to the JSB Exacts that Hull Cartridge used to test my HW100 when it went back for maintenance.
     
  19. Dayrth

    Dayrth Engaging Member

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    Weigh your pellets before testing. You could have a tin that's lighter than the weight on the lid, which would give you false higher readings. I had the opposite problem with a tin of QYS, consistently low fps. I weighed them and found they were all heavier than the supposed weight by a significant margin.
     
    WhyteCat likes this.
  20. WhyteCat

    WhyteCat Engaging Member

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    Hmmm, so a re test with 4.49’s or 4.50’s would be interesting with monsters & everything :) - which the nerd in me loves !

    I have always gone 4.52 as when I bought the rifle as thats what was recommended & I have to say accuracy with AA fields was spot on. But we all like a bit of nerdy/anorak stuff I like to think o_O Seriously though this is an education first hand, all part of gaining the knowledge :thumb:
     
    Dayrth and Chouchin66 like this.

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