40 S&W Through A G29 W/O Conversion?

Discussion in 'General Glocking' started by BigKev98, Jan 30, 2010.

  1. BigKev98

    BigKev98

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    Last night the subject came up of shooting 40S&W in a G29 w/o conversion barrel. My friend who is retired Air Force swears he does it all the time. I think I've read somewhere on here that's not safe to do. He will be seeing this post tomorrow night when he comes back to visit,so who is right?
     
  2. righteoushoot

    righteoushoot Deluxe Member

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    Retired from what Air Force? :rofl:

    He is yankin' your chain.
     

  3. K.Kiser

    K.Kiser

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    Not with My pistol..
     
  4. DEADLYACCURATE

    DEADLYACCURATE Senior Member

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    never really thought about it, but would not do it
     
  5. xrmattaz

    xrmattaz

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    Both the .40 and 10mm headspace on the case mouth.

    A .40 round in a 10mm barrel is headspacing on nothing. Friction on the brass case, and the extractor, would be the only thing holding the round in approximate position for the striker to hit the primer.
     
    Last edited: Jan 30, 2010
  6. hoffy

    hoffy

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    A round may go off if it is held tightly enough by the extractor, but it is a long way from headspacing. The worst case scenario I cam imagine is the primer being ignited, whilst the case being driven forward from the extractor and then being propelled sharply to the rear, more stress than the gun was ever meant to handle(like a dead blow hammer filled with lead, when you swing it down to strike the lead shot goes to the rear then suddenly slams to the front) . Someone may indeed be shooting this way, with the extractor holding the case, but it is playing with a bomb, get a 40 barrel, or if you want power, a 357 SIG barrel. Please inform your friend, you may be saving his fingers or worse. I wouldn't buy this gun if he is not pulling your leg.:wow:
     
  7. minkis18

    minkis18

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    Someone on here already tried this. it works but I see how it could be a potential KB.
     
  8. jaybirdjtt

    jaybirdjtt

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    10 mm case is .425 wide at the base of the cartridge x .992 long. The cartridge is designed to withstand a max of 44,000 psi. Mean working pressure is 37,000 psi.

    40 S&W is .424" x .85. .423" at the cartridge mouth. The case was formed by shortening a 10mm case. The round typically uses a lighter bullet. Less recoil, easier to handle and stay on target for follow ups. I think that's the intent.

    Personally, I would load some milder target loads using 10mm brass. You might need a lighter recoil spring if you do this. I'd be concerned with the long term effects of this practice in a semi automatic as I am not sure what happens to the chamber or if you might get into headspace issues. I think you bring variables into play here that don't come up in a revolver using 38 Special in a 357 mag.....that sort of thing.

    Maybe contact Lone Wolf? They may have a drop in barrel for using 40 S&W? If nothing else, they could tell you why this is a dangerous practice or not!?

    Did your friend vote for Obama, too? Just wondering.........

    p.s. Got it. Air Force! That explains everything. I'm a retired Navy pilot.
     
    Last edited: Jan 30, 2010
  9. NW-Warlord

    NW-Warlord

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    I wouldnt do it with my G29. However I have shot .380 out of 9mm Luger pistols before. I think the same principle would work on the 10mm to .40.
     
  10. mteagle1

    mteagle1

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    It is NOT a potential KB. At worst it MIGHT blow out the magazine. At the police range I have found several 9mm's fired in 40's because the officer didn't look to see what he was loading in the magazine. I could name the Montana reloading company but that probably is not within the purview of this forum. Most of the shots sounded funky and didn't extract and the officer had a funny look on their face.
     
  11. BigKev98

    BigKev98

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  12. G33

    G33 Frisky! CLM Millennium Member

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    In an emergency, out of 10mm you can use .40...
    I have tried it only on my Glock 10mms.
    Easy to replace parts.
    As above, only the extractor is holding the case.

    So, try to avoid this practice.
    Get a Lone Wolf .40 barrel.
    :supergrin:
     
  13. jaybirdjtt

    jaybirdjtt

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  14. Ebb27

    Ebb27

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    While i don't recommend doing it I have shot .40 out of my G20.


    It worked just fine and didn't blow-up my gun like a pipe-bomb.


    While not a great idea it can be done in an emergency, but if you plan on doing it on a regular basis I would highly recommend getting a conversion barrel just to be on the safe side.
     
  15. KilgoreTrout

    KilgoreTrout Impossiblist

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  16. sigcalcatrant

    sigcalcatrant

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    Why is that? It's not a good idea, but it doesn't hurt anything. The worst that will happen is you won't be able to chamber a 0mm round due to a build up of gunk just in front of where the .40 brass ends in the chamber.
     
    Last edited: Jan 30, 2010
  17. G33

    G33 Frisky! CLM Millennium Member

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    Ah, Dean the pulitzer winner.
    :supergrin::supergrin:
     
  18. ssgt_acft_mech

    ssgt_acft_mech

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    Easy easy! He didnt say what he did in the AF. Even I know its pretty damn unsafe to use a round that a barrel isnt chambered for. I think the guy is pretty nuts.


    <<<----AF aircraft mechanic
     
  19. KilgoreTrout

    KilgoreTrout Impossiblist

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    dean is formerly famous.

    says so there at the bottom.
     
  20. jaybirdjtt

    jaybirdjtt

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    What would life be like without interservice rivalry?