JSB King Heavy .25 ballistic coefficient?

Forums Pellets, Projectiles, Slugs, & Ammo JSB King Heavy .25 ballistic coefficient?

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    Deleted Account

    How can I find the ballistic coefficient of these pellets?

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    gamyrick
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    ChairGun Pro list the BC for the JSB King .25 as 0.0360. Link to previous discussion.
    http://airgunnation.dev/topic/heavy-and-light-jsb-25-cal-pellets-comparative-ballistic-drag-coefficients/

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    ajshoots
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    ST barrels seem to be producing BC’s around .04. Conventional barrels are reporting around .05.
     

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    gamyrick
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    While it is accepted that BC is a function of mass, diameter and drag coefficient there are many, many factors that need to be taken into account. The type of barrel, diameter, riffling, interior roughness value, temperature, humidity, altitude and on and on and on. I’ve had two TX200 MkIII air rifles. The first being stolen in Phoenix. Each rifle had a slightly different BC using the .22 H&N Baracuda Green pellets. Each rifle was tested under the same environmental conditions at the same facility. The first TX had a BC of 0.0135 while the second had a BC of 0.0137. This slight change did not effect the POI, however, it did effect retained energy. 0.0135 = 90% at 6yds, 80% at 13yds, 70% at 20yds, and 60% at 29yds. 0.0137 = 90% at 6yds, 80% at 13yds, 70% at 21yds, and 60% at 30yds.   

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    ajshoots
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    BC is always changing and some ballistic programs allow you to enter multiple BC’S for extremely precise data and shooting at multiple ranges. Most airgunners don’t need to take it to that level and can get what they need from one general bc. Gamy rick points out this and it is up to the end user to decide how deep they are going to take there shooting. In most cases, even an averaged BC works well for general 100 yard and under shooting. Things surely get more critical as distance increases!!

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    gamyrick
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    You’re absolutely correct.

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    Monkyshine
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    This BC is working well for me in my ST barrel. .0426
    https://goo.gl/photos/oo5cY2dY1ip6tPbKA

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    Deleted Account

    Hi Monkyshine. I’m unable to view your pics. What rifle are you using and how many fps is it shooting? Thanks

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    ajshoots
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    It is a screen shot of the chairgun mobil app. 818fps. Doesn’t say what gun? Sure Monkyshine will chime in and let us know.

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    Monkyshine
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    I reworked the link for you but yes 818 average with FX Bobcat MKl unregulated. Hope this helps fast Eddie.

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    Deleted Account

    Yes. Thanks guys

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