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USPSA load question

Discussion in 'Reloading' started by Billy_Ray, Sep 22, 2012.


  1. Billy_Ray

    Billy_Ray
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    I have been running my USPSA load as follows for production:

    9 mm - 124 grain FMJ
    4.2 grains of Titegroup
    OAL 1.13

    I had figured based on others comments and the reloading manuals that this would produce approximately a 127 - 129 power factor, giving enough safety margin to always be over. But at a recent match, they had a chronograph setup and my load chroned at 1103, 1105 and 1106. Meaning my load is running a PF of 137. Based on this I think I can drop my powder to 4.0 grains of TG. I know that this is just one data point, but I am looking for some input, what say you?

    Thank you,
    Billy Ray
     

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  2. SJ 40

    SJ 40
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    I think the best thing to do would be invest in a chronograph. For what you are doing it will give you the answers you are looking for,without waiting until you get to a match to find out. SJ 40
     

  3. jdavionic

    jdavionic
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    Here is some of the data that I recently posted. All fired from a G19 in an indoor range (temp 74).
    124 gr MG PHP
    Titegroup 4.1g
    Avg OAL 1.117
    Avg vel 1107 fps
    PF = 137

    124 gr Ranier PHP
    Titegroup 4.1g
    Avg OAL 1.127
    Avg vel 1100 fps
    PF = 136

    124 gr Ranier PHP
    Titegroup 3.9g
    Avg OAL 1.127
    Avg vel 1054 fps
    PF = 131

    Be mindful that I am using different bullets than you are. With that said, I agree with the other gent (SJ40). If you're trying to fine tune closer to the minimum PF, you should get a chronograph.
     
    #3 jdavionic, Sep 22, 2012
    Last edited: Sep 22, 2012
  4. Zombie Steve

    Zombie Steve
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    Decap Pin Killa

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    Helps to know what gun / barrel length you guys are shooting from if you're posting velocity. May not translate well from one gun to another.


    Where's Little Stevie? He's all about them squeaker loads.

    :supergrin:
     
  5. Hoser

    Hoser
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    Ninja

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    That is almost my exact same load, only I use the 124 JHP.

    Maybe bump it back a hair, but if it is working and accurate, dont change a thing.
     
  6. shotgunred

    shotgunred
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    reloading nut

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    Back when I used tight group my load was 4.1 tg with a 124gr at 1.125 OAL. It chronos around 1110 at sea level.
     
  7. Colorado4Wheel

    Colorado4Wheel
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    I wouldn't drop it more then .2gr. Personally I would drop it .1 and call it good.
     
  8. Billy_Ray

    Billy_Ray
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    I am shooting a Glock 17 if that helps.

    I was thinking of lowering the charge by either 0.1 or 0.2 grains. 0.1 is probably the best way to go.

    Thank you all for the feedback.

    Billy Ray
     
  9. shotgunred

    shotgunred
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    reloading nut

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    Do you think you would notice the difference of .1 grain?
     
  10. Boxerglocker

    Boxerglocker
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    Jacks #1 Fan

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    I have run 4.0 TG with a 124 FMJ at an OAL of 1.135 since I started loading for IDPA/USPSA.

    Chronos 1150 Fps average out of my G34 (142 PF) in my G19 back-up (carry it will drop to about 1080 (134 PF).
     
    #10 Boxerglocker, Sep 22, 2012
    Last edited: Sep 23, 2012
  11. km625

    km625
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    Your G34 velocities and PF are correct for 115gr bullets. With 124gr bullets they come out at 142PF. Only noticed because I use 124gr at 1100pfs (3.9 TG) and that yields 136.
     
  12. Boxerglocker

    Boxerglocker
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    Jacks #1 Fan

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    Your correct. I copy and pasted the wrong load out of my reloading data spreadsheet. Post changed. Thank you
     
  13. sciolist

    sciolist
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    My 34 runs fine on 130-132PF. I've experimented with 124 loads from the high one-teens up to 150PF or so, for USPSA and Steel. There's a pretty noticeable difference in feel between low 130's and high 130's.

    Low 130's works well for me.
     
  14. MoNsTeR

    MoNsTeR
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    I think you could safely drop it a tenth, but a little more power is going to take down poorly-calibrated poppers just that much better.