JSB express

Discussion in 'General Airgun Chat' started by BDL, Jun 27, 2014.

  1. BDL

    BDL Dangerous

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    Going to try some express Sunday but how fast can they go to be legal in a GP?

    Cheers Bri
     
  2. NJR 100

    NJR 100 Because I`m AWESIME !!

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    from memory, 820 fps
     
  3. gavin hopps

    gavin hopps GP 2015 C GRADE CHAMP

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    Hi hear is a web site,
    http://extorian.co.uk/shooting/pellets.html
    that you can put in pellet weight and the speed to see if power is legal or not.
    Im going onto them myself as can up the fps by about 40fps.
    Gav
     
  4. BDL

    BDL Dangerous

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    Cheers Si think it was about 810 so will check again tomorrow
     
  5. steg

    steg Member

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  6. BDL

    BDL Dangerous

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    Useful site cheers, they grouped well the other day testing and chrono was very consistent too so I can up it a little too.

    Bri
     
  7. Conor

    Conor Never been banned from sales Staff Member

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    Group best between 805fps
     
  8. Ratinator

    Ratinator 77.74

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    Leave it alone

    There is nothing to be gained by turning up the power,if they group we'll then leave the power where it is.
    I ran express through my Walther at 800 fps with great success,it's a misconception that things need to be run flat out.
     
  9. BDL

    BDL Dangerous

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  10. BDL

    BDL Dangerous

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    I'd agree I wouldn't run them flat out as it's never good
     
  11. Conor

    Conor Never been banned from sales Staff Member

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    I meant 795-805
     
  12. BDL

    BDL Dangerous

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    Okey dokey mate
     
  13. RobF

    RobF Administrator Staff Member

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    Yeh. I've found no benefit to running them tight up. 800 is where I set mine. It gives a safe margin for chrono pellet and gun variation, and uses less air, kicks less. The amount of wind it takes or range you can is imperceptible. I won the csfta winter league running express at 770.
     
  14. BDL

    BDL Dangerous

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    Just got in and they are settled at 798 and grouping well, my 55 has changed down from 14 to 13 everything else is the same.

    Is that normal ?

    Cheers Bri
     
  15. DEAN C.

    DEAN C. Steyr Convert

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    Up to 50/55 yards my MPR's dont change POI from 7.9 to 8.4 AA/JSB's.
    I think that they might just have a yard shorter first zero thats all depending on the gun.

    I just find that in any wind they go all over and not as predictable as the 8.4's, although I cannot prove it other than what I have seen occasionally on paper. Thats another debate though.:(
     
  16. Ratinator

    Ratinator 77.74

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    No change

    I ran Jsb 8.4 and 7.9 of the same click chart,others will argue this but it is correct.
     
  17. madplinker

    madplinker Member

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    Which takes more wind

    Which takes more wind a jsb express at 7.9 grains traveling at 810 fts shot from same rifle say a steyr and also at the same distance say 40 yards or does the 8.4 grains exact traveling at 785 fts take less wind. The wind is a full value wind at 10mph. Any ideas anyone ????????????
     
  18. RobF

    RobF Administrator Staff Member

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    nothing between them in my experience.
     
  19. Brian.Samson

    Brian.Samson Allowed in Sales Staff Member

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    Depends on the pipe they're being pushed through.

    Very difficult to prove one way or the other with real world testing. The variability of conditions makes it almost impossible to conduct an objective test.
     
  20. madplinker

    madplinker Member

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    both pellets shot from the same rifle on the same day so no temperature differences only thing is different is the feet per second value and weight of the pellet ????
     

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