FX Impact best fps for JSB MKII

Forums PCP Airguns FX Impact best fps for JSB MKII

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    GQ
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    Guys can you share what is your best fps shooting JSB MK II at 50 and 100 yards.
    For your best groupings.
    Mine is 850 fps.

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    FunGun
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    (don’t mean to hijack your thread, since you are asking specifically about the FX Impact but thought I would share, hope it helps)
    I have a note here from one of Ted’s videos that he liked 880fps for his new crown .25, but shooting the MK2 JSB Heavy at 50yds he was shooting 832fps.  So I am assuming the 88fps was the speed of the 25.3g and when shooing the heavies they measured 832fps with no changes to settings of the FX Crown.  Have you tried lower speeds by any chance?  and what were the results?

     

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    GQ
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    Yes  i have tryed 830 fps but at 100 yards the pellets were not stable and not accurate enough for my taste.
    At 850 the pellets are very stable. SD is 3.0 over 16 shots wilth full air reservoir.

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    vladb
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    I haven’t notice much difference in the range between ~750 and ~880 fps for JSB MKII pellets at 50 yards distance. It shoots about the same for me.

    ps. 890 is the max speed I could achieve for some shots after fresh refill. Usually after 10 shots it degrades to 880. However, accuracy for those shots is noticeably worse.
     

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    GQ
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    At 50 yards it is quite the same whatever the fps.
    At longer range there is an important difference.
    The grouping open more.

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    Eddy1840
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    Mine is shooting at 850 fps very accurate at 60 yards,a want to try the mk1 

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    GQ
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    I think the best way to know how accurate you can be is to shoot at minimum 80 yards.
    For me shooting at 50 yards is boring.

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