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Thread: JSB Exact Extra Heavy 10.2gr

  1. #1
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    Default JSB Exact Extra Heavy 10.2gr

    I saw on the web that the JSB Extra Heavy 10.2gr has a Ballistic Coefficient of 0.038.The Crosman Premiers Heavy 10.5gr has a BC of 0.025 and the H & N Extra Heavy Baracuda Match 10.65gr has a BC of 0.024. What I understand under BC is that the higher the BC the less drag on the projectile and the less loss of velocity hence more hitting power downrange, is this correct? Does any one have a Ballistics Programme to work out how much energy the JSB will have left at 50 meters if fired from a 18ftlbs airgun compared to the H & N and the Crosman Premiers mentioned above?

    Velocity would be: JSB:893fps
    : Crosman 880fps
    : H & N 873fps
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  2. #2
    Sharp Shooter

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    Chairgun will do that for you.
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  3. #3
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    Where can I get that gerrief? $$?
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  4. #4
    SAFTAA Chairman
    Protea FT Team '12/'16/'17
    MOT: Steyr Sport Service South Africa

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    google chairgun 2
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  5. #5
    Sharp Shooter

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    Try [link=http://www.chairgun.com/]here.[/link]

    I've used the H&N pellets in my high power with great success. Very accurate.
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  6. #6
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    Spyker, my primary pellet is the H & N arracuda Match and it is very good (bragging:shot a 8mm 45meter 3 shot group sitting on my bum), the Crosman Premiers is also very accurate, the batch I had was just very stiff to get into the barrel (to the point that they huted my finger)so I worry that they might damage my seals. I want to try the Exact but I first want to see if they offer an advantage over what i already use.
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  7. #7
    Sharp Shooter

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    Were the H&N's difficult to get in the barrel or the Crosman's?
    The JSB's will be more expensive I reckon.
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  8. #8
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    The Crosmans gave me pain, after about 150 pellets I could feel I was starting to get a blister on my thumb from pushing them in, they H & N Barracuda Match go in smoothly and they are 4.50mm. I dont know the size of the Crosmans they did not say the size( no they were not 5.5mm!!!). The H & N I buy for R99 and the Crosmans for R67,50, I saw importer has a limited quantity of JSB heavies for R95 a pop.
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  9. #9
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    For interest sake: At 50 meters the JSB's will have 13.08 ftlbs
    the H & N and CP have 10.80

    At 70 meters the JSB's have 11.19 ftlbs
    the H&N and CP have 8.85

    At 100m the JSB's have 9ftlbs
    the H&N and CP have 6.48
    This is according to Chairgun
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