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Some interesting chrono results

Discussion in 'Reloading' started by jdavionic, Sep 15, 2012.

  1. jdavionic

    jdavionic NRA Member

    May 1, 2008
    First, I'll preface by saying I try to get my competition loads near my carry loads. Not to say that I'm knocking those that aim to be slightly above the min required PF. Different folks compete for different reasons...which is great. The more that compete for whatever reason, the better.

    All rounds fired from a G19. Temperature at the range was 74F.

    124 gr MG PHP
    Titegroup 4.1g
    Avg OAL 1.117
    Avg vel 1107 fps

    124 gr Ranier PHP
    Titegroup 4.1g
    Avg OAL 1.127
    Avg vel 1100 fps

    124 gr Ranier PHP
    Titegroup 3.9g
    Avg OAL 1.127
    Avg vel 1054 fps

    Hornady CD 115g FTX
    Avg OAL 1.078
    Avg vel 1151 fps

    Federal Hydra Shock 124g
    Avg OAL 1.055
    *Avg vel 1011 fps
    * Note - data includes 1 round that was obviously low pressure. Made an alarming low sound. I examined the spent case and didn't see anything unusual. The velocity of that round was only 721 fps.

    Question -
    My standard dev on velocity was around 14 fps on the 3.9g data. The SDEV was close to that on my other reloads. Is that typical for you?
    Last edited: Sep 15, 2012
  2. F106 Fan

    F106 Fan

    Oct 19, 2011
    Sometimes better, sometimes worse. I have a 6.5x284 Norma load that has a SD of 6.1. Velocity is 2660 to 2676 fps. The stuff shoots pretty well.

    I have some pistol loads with single digit SDs but the funny thing is that I don't care about the pistol loads. I just want the average velocity to make some arbitrary and meaningless power factor. I don't compete so such things don't really matter.

    The rifle loads I do care about. I haven't gone completely around the bend on trying to obtain uniformity but I'm considering it.


  3. Colorado4Wheel


    Nov 2, 2006
    I usually get SD in the single digits when I work it up to my better loads
  4. WiskyT

    WiskyT Malcontent

    Jun 12, 2002
    North Carolina
    My SD's with pistol loads are usually around 20. I used mixed brass and that makes a big difference as every round has different neck tension. Obviously I don't care.
  5. jdavionic

    jdavionic NRA Member

    May 1, 2008
    I used mixed brass as well.

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  6. fredj338


    Dec 22, 2004
    The only way, if it even matters, to get single dig SD is to load same manuf brass fired the same number of times. It also helps to use a faster powder or slower powders w/ compressed chargers. Case neck tension is the driving part of that though. It really only matters to the gamers trying toget their ammo to just over min PF. It really has little to no affect on psitol ammo shot under 25yds.
    Last edited: Sep 16, 2012
  7. shotgunred

    shotgunred local trouble maker

    Mar 1, 2008
    Washington (the state)
    You are not straying very far from "gamer loads". The most common one I am aware of is 4.1 TG with a 124g at 1.135 OAL chronos at 1100-1110 range. Personaly I fell that pushing the 9mm 124 to 130 -135 pf range give you more accurate ammo.
  8. dla


    Oct 19, 2002
    Hillsboro, Oregon
    How many shots did you do for the SD?
  9. jdavionic

    jdavionic NRA Member

    May 1, 2008
    10 shots per load type