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Thread: Ballistic Coefficient of .20cal JSB and Eun Jin

  1. #1
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    Default Ballistic Coefficient of .20cal JSB and Eun Jin

    anyone know? :smokin
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  2. #2
    Protea FT Team '08

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    Boondock why dont you work it out on Chairgun ?
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  3. #3
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    oh? how?
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  4. #4
    Marksman
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    chrony at muzzle, chrony at 30m, plug in the figures and you have the BC
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  5. #5
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    Boondock- please post the results when you have them.

    What is the bc for the .177 AA field?
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  6. #6
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    What's bc ?
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  7. #7
    Protea FT Team '08

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    Ballistic coeficient.In other words how easy does a pellet fly through the air .
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  8. #8
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    What is there you don't know Allan. But Thanks anyway.
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  9. #9
    Protea FT Team '08

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    Hey Im learning too.
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  10. #10
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    Allan,
    you suggest chairgun as most people would but are you 100% with the data there? the formulas and the graphs must be ok but the data? I just checked the weights of a few pellets and I found variances with the manufacturer.
    Pro magnum 8.1 instead of 7.71, FTT 8.6 vs. 8.64, Baracuda 10.6 vs. 10.65, HN silver point 11.7 vs. 11.57, HN sport 8.1 vs. 8.18. Others were ok though. Someone may claim the variances tro small but has anyone checked these data (weights or BC?
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  11. #11
    Protea FT Team '08

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    Yannis Chairgun will work out your BC.You need to input the data though.
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  12. #12
    Sharp Shooter

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    Boondock, I will check the bc for you this afternoon and post the results...
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  13. #13
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    Chairgun is almost like an empty Excel spreadsheet, you need to add data(read calibrate) in order for it to function correctly.
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  14. #14
    Sharp Shooter
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    boondock

    One value quoted by the Airgun Handbook, states 0.0273..... for the JSB .20 calibre....
    Seems about the right ballpark figure...
    Let us see what Fox's value is, though....
    I am sure guido also had ballistic figures for the JSB some time ago.......????

    Malan
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  15. #15
    Marksman
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    ye, it was higher than the one quoted though, both in .177 and .20...can't seem to find it now.

    only way to really know is to measure velocity at the muzzle and at 30 or 50 yrds

    BC for the same pellet can vary depending on barrel twist rate.
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