Labradar Users

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    EliteAirgunr
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    Can we get an update on actual BC for JSB .30 44gn pellets. I have only one actual source (Edgun West/Bryan @ .05xx) and would like to get some other input if possible.

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    davecole
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    Sorry, I don’t have a Labradar. My shooting chrony has been faithful and consistent for many, many years.

    I tested the BC for the JSB .30 44g in my Evanix Rainstorm 2. Muzzle was 845, 30 yards was 763 and 50 yards was 717. ( I de-tuned the gun )

    the calculated BC was .037

    When inputting this data into chairgun and testing accuracy of suggested hold over I found the data correct. 

    Because the BC changes with the pellet’s velocity, there is actually no single BC for any airgun pellet. They are also affected by the gun used to shoot them. 

    All the best.

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    T3PRanch
    Participant
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    Look at the bottom of this page which agrees with davecole:

    https://hardairmagazine.com/ballistic-coefficients/

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    Centercut
    Participant
    Member

    I agree, even with the .30 ST barrel in my Bobcat Mk2. Somewhere in the .037 to .038 range works out well for holdover in Strelok Pro, and I'm shooting them at 885 fps. Even though the gun shoots the 50.1 grain pellets at 850 fps, which is 35 fps less, I have less drop at 100 yards than the 44.75 grain pellet at 885 fps. The BC on the 50.1 grain is just so much better, and accuracy is about the same. I think the BC is somewhere around .050 or maybe a bit more or less…  So if your gun can shoot the 50.1 grain pellets, there is no reason not to go with them, since the price is the same as the 44.75 grain pellets.  Plus, the FPE is higher! 

    I can't say all the above holds true for the STX barrels, or for the LW Poly barrels. Don't have either. But I do know the guys that shot .30 at EBR from an ST barrel last year shot the 50.1 grain pellets, at least the guys that I asked…

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    EliteAirgunr
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    If you don't mind stating who you asked shooting 50.1g at EBR, because everyone I talked to was shooting 44.75gn.

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    EliteAirgunr
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    Thurmond

    Look at the bottom of this page which agrees with davecole:

    https://hardairmagazine.com/ballistic-coefficients/

    I see that they are sometimes shooting at speeds not common with todays standards of speeds. So I now realize I will have to do my own testing with my gun and the speeds I might like to shoot at.

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