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Problem shooting reloads in new G34

Discussion in 'General Glocking' started by jwc17, Mar 15, 2010.

  1. jwc17

    jwc17

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    I just bought a new G34 and am having trouble with failures to feed and stove piping with the load I use in my other 9mm Glocks.

    The load is a 125gr bullet over 4.6 grains of Winchester 231. It works perfectly in my G17 and G19 but suspect it may be too light for the extra weight of the G34's slide.

    Should I consider using a lighter guide rod/recoil spring so I can continue to use this load? If so, which one?

    I bought the G34 primarily for use in IDPA matches, so I would appreciate any information regarding effective loads for this purpose too.
     
    Last edited: Mar 15, 2010
  2. Butch

    Butch RetiredDinosaur CLM Millennium Member

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    No......if you could weigh the G17 slide and the G34 slide, you'd find that they very nearly the same weight. Something else is wrong.
     

  3. DannyR

    DannyR Moderator Millennium Member

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    Run 200 rounds of American Eagle 147-gr FMJ ammo through your new G34 to loosen up the spring, or swap springs with your G17. I think WW231 is a poor choice for 124-gr and 125-gr bullets. It's also a less that desirable choice for 115-gr bullets.
     
  4. DannyR

    DannyR Moderator Millennium Member

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    For IDPA and GSSF, try a 147-gr Montana Gold over 5.0-gr of AA#5, Federal Primers, OAL of 1.150 inches.
     
  5. jwc17

    jwc17

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    I have a large supply of Winchester 231 and like the way it works in my other guns. Can anyone here recommend another bullet or solution to my problem with the G34 cycling. This really surprised me considering how well the load works in my G17 and G19.
     
  6. Zombie Steve

    Zombie Steve Decap Pin Killa

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    If you're shooting reloads, make the ammo fit the gun, not the gun fit the ammo.


    I don't use 231, so I'm not going to be the expert here, but Sierra's data with a 125 grain fmj bullet goes up to 5.1 grains of 231 (OAL 1.090). You might up the ante a bit at a time and see if that helps.


    Factory ammo run ok? Not the gun, right?


    FWIW, I use 4.7 grains of Unique with a 124 grain fmj for about 950 fps from a Smith 910 (1.145 OAL).


    You might also go to the reloading forum... I know Colorado4wheel shoots a G34. Good luck.
     
    Last edited: Mar 15, 2010
  7. DannyR

    DannyR Moderator Millennium Member

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    I don't think you can get there with 231 unless you are using lead bullets.

    115-gr lead, 4.8-gr 231 = 1,125fps

    125-gr lead, 4.4-gr 231 = 1,086fps, oal 1.125 inches

    See:
    http://data.hodgdon.com/cartridge_load.asp
     
  8. DannyR

    DannyR Moderator Millennium Member

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    Again, swap recoil springs with your G17.
     
  9. Colorado4Wheel

    Colorado4Wheel

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    Have you chrono'd? What type of bullet?
     
  10. jwc17

    jwc17

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    No, I do not have access to a chronograph. They are X-Treme copper plated bullets, 125 grains.
     
  11. rug357

    rug357

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    I have a G34 that I use my reloads in.
    I load 125gr Winchester FMJ with 4.3gr Win231 with OAL of 1.125".
    It goes right at 1,000fps from my Glock17 so I assume about 1,040 fps from my G34.
    This load runs 100% reliable in my G34 with factory barrel.
    I think you should check your OAL and make sure it is 1.090" or longer.
     
  12. GOA Guy

    GOA Guy

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    This is good advise. Your 17s recoil spring may be broken in some. It may have been lighter from the start too. While some may want to argue this point with me, not all Glock factory recoil springs are equal. I think they are better today than they used to be though.
     
  13. MoNsTeR

    MoNsTeR

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    While I agree that you should not go to a lighter spring as a solution to this problem, you should try a lighter spring anyway because lighter springs are better. IMHO.
     
  14. randyc74

    randyc74 Custom Holster Maker

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    I run 115 Gr. FMJ bullets over 5.5 Gr. of Unique in my G34. I'm not sure what they chrono at, but they do make minor power factor for IPSC competition.
     
  15. jhayesvw

    jhayesvw

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    i run 4.3 grains of HP 38 (same as Win 231 but cheaper) with a 125 grain dardas cast bullet.
    i get 1050fps and no issues except the combo smokes a bit.
    i would swap the recoil spring with an IMSI 13lb spring as many others have done, or just put the 17 spring in there to see how it goes.

    you could try upping the powder .2 or so, but i dont think that will solve your issue.
     
  16. mboylan

    mboylan

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    Switch to TiteGroup or Solo 1000. Drop to 15lb on your recoil spring. I don't trust 13 lb without a reduced power striker spring.
     
    Last edited: Mar 15, 2010
  17. Zombie Steve

    Zombie Steve Decap Pin Killa

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    Scrap the data I gave earlier, it was for a full metal jacket.
     
  18. coal

    coal

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    IMO, your slide is not fully cycling. You need more push from those reloads, or need to let your recoil spring break in. I have the same issue in my G26 using my weaker G19 reloads.

    Or, you might have a tight extractor. You could try swapping parts from your G17. Or, let it break in, too.


    p.s. shot-in-the-dark, but have you chamber-checked those loads just in case your G34 has a tighter chamber?