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.40 chronographed loads

Discussion in 'Reloading' started by norton, Sep 1, 2010.


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  1. norton

    norton
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    I checked my 5.5 grains of unique with Winchester primers and 165 grain fp bullets.
    My readings averaged 1102 fps.
    My Lyman manual shows this is too fast.
    5.5 is listed as right at the minimum.
    What gives?
     

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  2. robin303

    robin303
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    Helicopter Nut

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    I get 943 FPS with Unique with 165 Berry's at 5.6 grns with a 1.120 OAL out of my G23.
     

  3. Colorado4Wheel

    Colorado4Wheel
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    Complete load data is kinda critical in this situation.
     
  4. norton

    norton
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    Gotcha Colorado.
    1.120 OAL. The bullet is a flat point, plated. Taper crimped with RCBS dies.
    Firing a Glock 35. It does have a longer barrel then the standard Glock. Could this be at least part of the difference?
     
  5. Colorado4Wheel

    Colorado4Wheel
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    What primers are you using?
     
  6. norton

    norton
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    Winchester small pistol primers.
    WSP.
     
  7. albyihat

    albyihat
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    compare the test barrel length to the length of yours. Longer bbls. generally equal higher velocities with the same powder charge. Is the brass showing signs of high pressure? 1100 fps for a .40 with a 165gr bullet is not too fast although it is getting to be on the high side of things. I personally consider 1100 fps. with a 165gr to be about right for a high power .40cal load.
     
  8. Colorado4Wheel

    Colorado4Wheel
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    If you look at the data from Unique's website it's even more confusing. I would just dial it down .3 grs and retest. 1100fps is a little fast compared to the data Unique post for their 165gr JHP loading.
     
  9. fredj338

    fredj338
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    All guns are diff, it's why a chronograph can actually get you in trouble if you don't understand that there are many variables to getting a particular velocity. I run 165gr Berry's plated o/ 6gr of Unique, CCISP, 1.125" Velocity runs just under 1000fps in two diff guns. The longer bbl could get you about 50fps more, but that is about it. Your OAL is a bit short, that also adds some pressure & increases vel.
    I know this sounds dumb, but make sure the bullets weigh 165gr, Berry's has been known to ship the wrong bullets in the right box. You could also have a tight chamber or bore, diff cases than the printed data, it all adds up. Keep in mind that plated bullets load between lead & jacketed. Also, plated bulelts are often sized 0.001" larger in dia. So a plated bullet will often yield slightly higher vel than a jacketed of the same weight. All these things will cause velocity variations from gun to gun. It's pretty much the norm to NOT be able to match printed data vel exactly.
     
    #9 fredj338, Sep 2, 2010
    Last edited: Sep 2, 2010
  10. Daryl in Az

    Daryl in Az
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    You also may want to double check your scale for accuracy.

    Are you using new powder, or is it some you've had a few years?

    Powder will sometimes dry out a bit over time, so you end up getting more "charge" by weight, resulting in higher pressures and higher velocity with the same weight load.

    Daryl
     
    #10 Daryl in Az, Sep 2, 2010
    Last edited: Sep 2, 2010
  11. Rico567

    Rico567
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    These velocities sound about right to me. I load with the Rainier 165 gr. plated and 5.9 gr. of Hodgdon's Universal with a WSP & Winchester cases, and it'll turn around 1150 fps out of my G24 with its 6" barrel. This is a nice warm load; I wouldn't care to go any hotter.
     
  12. norton

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    Thanks for everyone's input.
    I will try backing the load down by .3 and see what velocity I get.
    I use a Lyman 1200 DPS 3 to throw and measure the charges.
    The bullets do weigh 165 grains. I always check them on my scale before loading.
     
  13. norton

    norton
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    Out to the range again this a.m. I loaded cases with 5.1 grains of Unique. I extended the OAL to 1.125. My average velocity this time, 965. I think I will go with a different powder-I am running out of Unique anyway.
     
  14. GioaJack

    GioaJack
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    Conifer Jack

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    Thank God you changed your avatar... the last one was frightening my dog.


    Jack
     
  15. norton

    norton
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    Uh, Jack that was my son. :whistling:
     
  16. GioaJack

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    Conifer Jack

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    And a fine looking young man he is! I often said to myself, 'self, that Norton fella' is one handsome specimen of a man, I'm surprised he has time to post on GT what with all the women that must be chasing him'.

    I often said that... really, I did.


    Jack
     
  17. Colorado4Wheel

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    How quickly jokes turn to tears on GTR.
     
  18. norton

    norton
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    In your honor Jack, I have taught my son that Blue is the truth and the light.
     
  19. marvin

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    i've had this problem for years.(well it's not really a problem i guess) i've got a glock 24, and i don't know how many times i've loaded a starting load only to have the fps a lot higher than i needed. once while loading some 200 grian bullets for IPSC i used the starting load with power pistol,(i don't remember what it was) it went well over a 1000 fps when i need under 900. so now if i'm trying a new load i know to start well under what the book says.
     
  20. DWARREN123

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    Are there any indications of over pressure such as flattened primers, flowed brass or cracks? If not not I would not worry as long as the pistols operates as it is suppose to.
    The chony may be off and the longer barrel may be part of the answer, also if the data came from a test barrel with cut type rifling then the poly rifling may also give a little extra FPS.
    This why we go slow and test.
     
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