.380 in a .9mm gun

This is a discussion on .380 in a .9mm gun within the General Firearm Discussion forums, part of the Related Topics category; Probably a dumb question, but, since a .380 round is a .9 mm that is 2mm shorter than a .9mm, can it be fired from ...

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Thread: .380 in a .9mm gun

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    New Member Array Teaser261's Avatar
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    .380 in a .9mm gun

    Probably a dumb question, but, since a .380 round is a .9 mm that is 2mm shorter than a .9mm, can it be fired from a .9mm fire arm? similar to the way you can fire a.38 special from a .357 magnum revolver.
    I just traded in a Ruger lcp on an a Kahr cw9 and I have a few .380 rounds left over. Any help is appreciated.

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    Senior Member Array Jackle1886's Avatar
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    Do not fire a round in a weapon that is not chambered for said round.
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    Yes it will work. It has been done MANY times without incident but just to be safe...............

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    VIP Member Array tkruf's Avatar
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    Quote Originally Posted by Jackle1886 View Post
    Do not fire a round in a weapon that is not chambered for said round.
    What he said! I wouldn't try it.
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    Senior Member Array BkCo1's Avatar
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    Agreed 100% ! Donate the rounds to someone with a .380.
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    It might fire, but why take the chance??? You don't want to end up the subject of an "Epic Fail" post. Give it to a buddy, go to the range with him and shoot it up, trade it, sell it...just don't do something you know the weapon or round isn't designed for.
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    my line of thinking is that it may well fire, but fail to eject properly, thus not cycling the next round JMHO????????






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    VIP Member Array Guantes's Avatar
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    "......I have a few .380 rounds left over."

    For "a few" rounds, I would not even bother trying it.

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    No thanks, sounds like a range incident waiting to happen.
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    VIP Member Array TN_Mike's Avatar
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    Don't do it. If the gun is not chambered for the round, don't try to fire that round in the gun. That's a good way to lose a gun and get yourself hurt in the bargain.
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    Member Array chiefneon's Avatar
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    Howdy!

    As a Firearms and Range instructor I have seen Officers during training unintentionally load the wrong caliber 9mm into a 40 S&W and 40 S&W in to a 45 ACP. Most of the time it is a fail to fire, but on occasion a round will discharge. When the round does discharge it usually sounds like a squid load and we stop the shooter immediately from firing another round. (Squid load is a low powered round that may not have enough power to exit the barrel making it dangerous to fire another round behind it as a round could be lodged in the barrel possibly causing a catastrophic failure of the weapon upon firing another round. A squid load will have more of the sound of a pop than a normally round fired in the right caliber). Don't really see this with factory ammunition these days but did occur with reloads we used, and why take a chance. All the discharges involving the wrong caliber (9mm into a 40 S&W and 40 S&W in to a 45 ACP) have not caused any damage to the weapon but it is not a recommended practice, and you are not going to get good results down range either. In other words DON'T DO IT!!!

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    Quote Originally Posted by chiefneon View Post
    Howdy!

    As a Firearms and Range instructor I have seen Officers during training unintentionally load the wrong caliber 9mm into a 40 S&W and 40 S&W in to a 45 ACP. Most of the time it is a fail to fire, but on occasion a round will discharge. When the round does discharge it usually sounds like a squid load and we stop the shooter immediately from firing another round. (Squid load is a low powered round that may not have enough power to exit the barrel making it dangerous to fire another round behind it as a round could be lodged in the barrel possibly causing a catastrophic failure of the weapon upon firing another round. A squid load will have more of the sound of a pop than a normally round fired in the right caliber). Don't really see this with factory ammunition these days but did occur with reloads we used, and why take a chance. All the discharges involving the wrong caliber (9mm into a 40 S&W and 40 S&W in to a 45 ACP) have not caused any damage to the weapon but it is not a recommended practice, and you are not going to get good results down range either. In other words DON'T DO IT!!!

    "Happy Trails"
    chiefneon
    Good advice, also with the case being smaller in diameter there is the distinct possibility of a case rupture that could cause damage to the firearm or the shooter.
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    No way that I will fire a round in a weapon that is not chambered for that caliber. And do not forget that revolvers and semi-autos are very different.
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    Member Array docdozer's Avatar
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    Agreed, don't do it. The chamber and cartridge need to seal correctly or you are asking for a problem. Sqib - with one "b" - by the way.
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    Quote Originally Posted by Teaser261 View Post
    Probably a dumb question, but, since a .380 round is a .9 mm that is 2mm shorter than a .9mm, can it be fired from a .9mm fire arm? similar to the way you can fire a.38 special from a .357 magnum revolver.
    I just traded in a Ruger lcp on an a Kahr cw9 and I have a few .380 rounds left over. Any help is appreciated.
    Rimless cartridges headspace off the front of the case. If you chamber a .380 round in a 9mm chamber, the extractor is the only thing holding the case against the breech face.

    Extractors aren't built to do that. Damage can result. Case failure is a possibility, which could damage the gun and the shooter.

    It's a bad idea, IMHO

    Matt
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