Glock-a-boom

This is a discussion on Glock-a-boom within the Defensive Carry Guns forums, part of the Defensive Carry Discussions category; Originally Posted by Bud White Also set back plays a big part in Ka booms with the 40 a couple thousands of a inch is ...

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Thread: Glock-a-boom

  1. #46
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    Quote Originally Posted by Bud White View Post
    Also set back plays a big part in Ka booms with the 40 a couple thousands of a inch is enough to drive the pressure way over Saami Limits and blow a barrel ..

    If you carry a 40 and load or unload often consider the bullet in the chamber unsafe after 2 loadings maybe 3 I have seen set back in a 40 on the first loading ..

    Different ammo makers have different rates of setback
    Amen to all that Bud! You may recall some set back tests I did with a number of different 9mm guns a while back. ALL the guns I tested, Sig, Beretta, M&P, H&K produced set back. Set back ranged from slight in most to horrible in the M&P.

    So your advice on load and unloading is right on! Plus, since I do have to load and unload a lot, ever since the tests I ran, I've started lowering the slide rather than dropping it.
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  3. #47
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    Quote Originally Posted by Bud White View Post
    Also set back plays a big part in Ka booms with the 40 a couple thousands of a inch is enough to drive the pressure way over Saami Limits and blow a barrel ..

    If you carry a 40 and load or unload often consider the bullet in the chamber unsafe after 2 loadings maybe 3 I have seen set back in a 40 on the first loading ..

    Different ammo makers have different rates of setback
    Bud,

    Can you explain 'setback' a little more? I'm guessing it has to do with the position of the shell in the chamber. Is this something I can see or check myself?

    Brian

  4. #48
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    Brian,

    Im not Bud, but set back is when the bullet is forced back into the case. I have seen a single 'drop slide' chambering produce slight set back. When the bullet is forced back into the case, the pressure goes up.

    I'm not following the unsupported chamber theory. It would seem that if the case is unsupported, the case would blow out rather than the barrel. At least the case rupture would cause a venting which would tend to lower chamber pressure, not increase it to a barrel splitting level.

    It seems to me that a squib would more likely cause extreme pressure in the chamber and barrel.
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  5. #49
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    It is when the Bullet is pushed back into the case farther when loading as the nose of the bullets bounce off the feed ramp it take a hell of a beating..

    If the crimp is not up to par or you have reloaded the same round a bunch it will start setting back into the case ..
    in turn raises pressure very fast and to dangerous levels ..

    Easiest way to measure it is to take a factory round and measure it say its 1.25 Over all length after you load it 3-4 times its 1.20 OAL time to ditch that round..

    you need to know what range your cartridge should be in any of us reloader's can tell if you list the specific round ..

    Most times when you look at the round you can tell a gross setback


    Ill get a pic of one from my 45 later with the story ..

  6. #50
    VIP Member Array Bud White's Avatar
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    Might not not be unsupported barrel cause it but ya have to remember the pressure still has to go somewhere lots of times it takes the mag out but when pressure isn't contained how its supposed to be it does real funny things


    Usually a Squib will ring the barrel but not usually blow like that..

    A charge of wrong powder with a squib would do that say a super fast powder .. not just a factory load squib..

    I have seen a few sqiub's and bullets fired behind them luckly not mine i cut open a barrel from 357 mag that had all 6 in the barrel with full power round its bulged but didnt blow same with a 9mm...

    i don't think i have seen a 40 blow first hand though ..

  7. #51
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    Thanks very much to Bud & Tangle for the explanation.

    I'm gonna go affix my Speer Gold Dots with a critical eye.

    (And a caliper)

    Brian

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    Storm Lake makes a very high quality barrel so I would not blame the barrel either.
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  9. #53
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    Quote Originally Posted by QKShooter View Post
    Storm Lake makes a very high quality barrel so I would not blame the barrel either.
    Thats true to and it should have the tighter chamber

  10. #54
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    I think you guys just addressed it all ready, but I think the talk of unsupported barrels has nothing to do with this case. Storm Lake (I don't have one but I am sure this is true) barrels are more supported than the standard Glock barrel. So it would follow that it shouldn't be a problem here. I do wish the had the .40 supported more but it's a trade off, like most things in handguns, for reliability in loading.

    Personally, I think part of the whole situation is that there are just so many Glocks out there that shere numbers will insure there are more kabooms. Even if the percentage is the same or lower than other guns. Personal opinion.
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  11. #55
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    The Storm Lake barrels are 416 Stainless - U.S.A. machined from bar stock - held to close tolerances - and hardened to Rockwell 40+

    Just to compare - I believe that BarSto are machined from bar stock also 416 Stainless and hardened to RC 39 - 42

    So really not much difference there.
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  12. #56
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    Are you sure he didn't limp wrist it?

    It's a joke.

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    Thank you very much for the information.

  14. #58
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    K-boom

    Had an identical failure last year with a 35, stock Glock barrel. Your pics look almost exactly the same. Cause was traced to a .40 reload that had too weak a crimp. Cycling caused set-back, compressed the powder, pressures went up....paperweight was created. No injuries to the shooter, except a hole where the boss chewed on him for shooting salvaged reloads in a rental gun. Glad no one was hurt.

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