Chrono Data: .40 S&W 165gr. GDHP and 180gr. SXT – GLOCK 23 and GLOCK 27

Discussion in 'Caliber Corner' started by awoodpd13, Aug 16, 2015.

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  1. awoodpd13

    awoodpd13

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    165gr. SPEER GDHP/53970 (Mrs. awoodpd13’s current duty ammo)

    G-23 (Gen. 4 – Mrs. awoodpd13’s current issued duty firearm)
    1. 1097
    2. 1081
    3. 1069
    4. 1087
    5. 1065

    AVG: 1079/426


    G-27 (Gen. 3 – Mrs. awoodpd13’s personal)
    1. 1034
    2. 1056
    3. 1044
    4. 1062
    5. 1050

    AVG: 1049/403


    G-23 (Gen. 2 - Mrs. awoodpd13’s former issued duty firearm; now personal)
    1. 1089
    2. 1124
    3. 1115
    4. 1088
    5. 1112

    AVG: 1105/447




    180gr. Winchester SXT/RA40T (Mrs. awoodpd13’s former duty ammo)


    G-23 (Gen. 3 – Mine)
    1. 931
    2. 926
    3. 968
    4. 949
    5. 921


    AVG: 939/352


    G-27 (Gen. 3 – Mine)

    1. 921
    2. 898
    3. 951
    4. 953
    5. 932


    AVG: 931/346




    Sunday, August 16, 2015/~85degrees F.
     
    Last edited: Aug 16, 2015
  2. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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    Looks quite good. When I get a Glock 22, I'll try this load.
     
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  3. Berto

    Berto woo woo

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    Thanks for the info. Looks like the SXTs were a little short on Wheaties.
     
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  4. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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    heh heh heh
     
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  5. Berto

    Berto woo woo

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    Gotta pimp muh brand.
     
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  6. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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  7. fortyofforty

    fortyofforty

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    Anyone else curious as to the higher velocity obtained with the Gen2 Glock as opposed to the Gen4? Could it be the higher round count leading to a "polishing" of the bore? Could it simply be the random variation in two individual barrels? Were the loads fired at the approximate same time and temperature?
     
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  8. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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    I have often wondered about this phenomenon.
     
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  9. awoodpd13

    awoodpd13

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    They were fired MAYBE 30min. apart, with no noticeable change in temp. (no thermometer, though).
     
  10. Berto

    Berto woo woo

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    Its
    It's weird, I have three 4" bbl .38sp K frames (mod 10, 15 and 64) and have chrono'd them side by side and seen 5 shot avg vary as much as 50-60fps between the three. Then on another day the 64 will be the 'hot' gun instead of the mod 10 or 15. Some guns just like certain ammo better than others.
     
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  11. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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    I am not so sure about getting a G22 now.
     
  12. gooffeyguy

    gooffeyguy In the STL

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    A newer/stiff recoil spring compared to a used/looser one could account to velocity differences. Remember, part of the rounds energy is used to move the slide rearwards. Bolt action rifles get slightly higher velocities than a semi-auto with the same ammo.

    It would be interesting to see this same test done, but after the first set of results, swap recoil springs and retest, then swap barrels and retest. Granted, you wouldn't be able to do the barrel swap with a gen2 and gen4, but you could try the gen2 RSA in the gen4 with one of those washer adapters
     
  13. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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    This sounds complicated.
     
  14. fortyofforty

    fortyofforty

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    This would mean that the pistols with more rounds through them will always produce higher velocities. How much can the recoil spring assembly play a role before the bullet leaves the barrel, anyway?



    Very curious.
     
  15. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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    Nice video, thanx!