AGN is proud to share HAM's BC database

Forums Pellets, Projectiles, & Ammo AGN is proud to share HAM's BC database

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    fishinwrench
    Participant
    Member

    Am I to assume that these BC values don’t apply when these pellets are shot from my Gamo Swarm with 100-150 less fps velocity ?

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    Slayerious
    Participant
    Member

    I think it will be slightly less, since BC rises pretty drastically towards the speed of sound (and for diabolos it will practically crash after that.)

    So expect to round off maybe 10-15%.

    Remember that the most accurate projectile should be used and be BC considered. So the list is a good place to look for candidates. 

    Anyways, everyone will have to verify the BC for actual sharp shooting.
     

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    Sear
    Participant
    Member

    Thank you HAM for your hard work in formulating and sharing the table. It is really appreciated.

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    fe7565
    Participant
    Member

    “SMH77”Thanks for the link and to HAM for testing / providing this data.  
    I do have a question though: the testing was performed with an FX Impact-I’m assuming that is the ‘FX smooth-twist’ barrel that was on the gun (it wasn’t listed)?  If so, how do I ‘convert’ these BC’s to the LW, LW-Polygon barrels I’m using on my gun?  I’m sure nobody has the exact data, but my particular interest lies the .25 cal JSB Exact 25.4 grn and Exact heavy (and MkII) 33.95 grain pellets (through a Polygon barrel @ 900 fps from a RAW HM1000x) and a .30 cal JSB Exacts (44.75 grain & 50.15 grain) from the same gun.  I’m also curious if there is data from the H&N Barracuda (31.02 grain, in .25 cal) pellets.  
    If anyone knows where I can obtain some of this data for these pellets from these barrels (and even from a RAW HM1000x would be an ‘bonus, bonus’), I would appreciate it greatly.

    
  There is a partial answer in this post by Yrrah comparing BSA barrel with ST: 

    Heavy and light JSB .25 cal pellets comparative ballistic drag coefficients.

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    stoti
    Participant
    Member

    Awesome to have all this information in one spot. It will definitely come in handy in the future and save us a lot of time figuring this stuff out for ourselves. Thank you!

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    hardairmag
    Participant
    Member

    But wait, there’s more!

    We have just added another batch of Ballistic Coefficients to the Hard Air Magazine database – mainly for H&N and Crosman pellets. Again, all are produced according to the same test protocol and, thus, are directly comparable to the existing data.

    Now, the HAM BC database contains a total of 111 Ballistic Coefficients:

    – 49 BCs for .177 cal pellets

    – 52 BCs for .22 cal pellets

    – 8 BCs for .25 cal pellets

    – 2 BCs for .30 cal pellets

    I’m glad to see that this data is proving useful and hope that the additional pellet BCs will be useful to serious airgunners everywhere 🙂

    Stephen Archer
    Hard Air Magazine
    https://www.hardairmagazine.com

     

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    Airgnconvert
    Participant
    Member

    Excellent info, Thank you HAM.

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    OkAirgunner
    Participant
    Member

    Thanks for the Info.

     

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    BDX
    Participant
    Member

    I share similar thoughts as SMH77 about barrel configuration influence. But I sincerely appreciate the compilation and I’ll wait to run some of my own tests on my rifle for comparison. Thanks again that was The BallistoWiki if I ever saw one. 

    George

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    sharksuper
    Participant
    Member

    Hi everyone, I share this video if you want to use it to calculate BC, in this case I could get an approximate value of the coefficients for slugs of 35 grains and the Gamo TS 22, which I did not find anywhere. The video is in Spanish but Subtitles can be used:

     

    • This reply was modified 4 months ago by sharksuper.
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    Dirtracer
    Participant
    Member

    This is what I was looking for 

    Thanks

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    mag_de_mars
    Participant
    Member

    Thank you very much

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