Library Version 811

Discussion in 'ELR, Ballistics & Bullets Board' started by DocUSMCRetired, Dec 5, 2018.

  1. DocUSMCRetired

    DocUSMCRetired

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    Library Version 811 is out now. Here are the notes on this version:
    • The update takes us over 800 bullets. Our one chance to use this video [​IMG] https://photos.app.goo.gl/KQuXxYPUux7JiYLo9
    • This update is based 100% on Doppler radar testing.
    • 6 Bullets were updated, and 24 new bullets were added.
    • New offerings from Berger, Lehigh, Sako, Sierra, and Trom.
    • The Berger 7mm 184 gr Hybrid is a rockstar! Higher BC than estimated/currently advertised: G1 = 0.706, G7 = .362. However, big caveat, you can't get this in the 1:9" twist. You need at least a 1:8.5 to get all that BC.
    • The 338 cal 245 gr Lehigh was a retest from 2015. We produced the exact same G7 BC for this bullet as we did 3 yrs ago (the G1 is a little different, and the CDM will also be a little different, but re-producing the same G7 BC average from 3000-1500 fps is pretty awesome considering 3 year gap, and different testing instruments (acoustic vs. radar).
    • See the change log here: Change Log from 787 to 811. The changelog shows you the change in performance and new bullet additions.
    • See complete library list here: AB Library 811
    Availability:

    Mobile Apps with AB Connectâ„¢: Immediately.
    Desktop Software: Update Expected Q1 2019.
    PC Profile Loader: Update Expected Q1 2019.
     
  2. steve_podleski

    steve_podleski

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    You or someone else have probably answered this question before but I missed it: to what distance is your BC calculated?
     
  3. DocUSMCRetired

    DocUSMCRetired

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    Distance isn't really important, its velocity that is. Our data is averaged from 3000 fps to subsonic. The BC is the Averaged BC across the measurement, but the CDM (which doesn't use a BC) has a complex set of data points through the entire velocity range.
     
  4. steve_podleski

    steve_podleski

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    Good. But if I want to to know the elevation change for my sights for 1000yd from a 100 zero, I would like to have the BC averaged from 100 to 1000yd.

    What is CDM?
     
  5. DocUSMCRetired

    DocUSMCRetired

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