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Discussion Starter · #1 · (Edited)
Hello, my name is Lucas Thompson. My .40 caliber Smith and Wesson Handgun breech swelled after firing 150 rounds of ammunition. The barrel started smoking, & I stopped to let it cool, then I fired the rest. I notice on my .40 caliber brass, the Brass is swelled at the head. I cannot seem to find a place that has extra barrels for my firearm? Does anybody know where I can find an extra barrels for my firearm? I would like to find one that is hardened steel barrel. I believe the steel was very weak, a very weak weak barrel. I've shot firearms all my life and I've never had a barrel swell the firing chamber like that and the brass swelled at the head. With only three Boxes of Ammunition worth, 150 rounds. The weak barrel is a factory defect.
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Some.40 S&W barrels have an unsupported base. It's a known problem with Glock pistols. Not sure about the S&W barrel feed profile. If the swelling of the brass was beyond the feed ramp area, this is a sign of serious overpressure.

Where did your .40 S&W rounds come from? Barrels should be pretty strong, and swelling indicates a very dangerous situation. Typically this can happen with improperly hot reloads, but was this factory ammunition? If so, what kind.

Personally, I would not shoot it if you have more of the same.

Firearms are proof fired in the final steps of manufacture. I'd be surprised if a barrel that wasn't properly manufactured survived that.

In any case, S&W is likely our only source for this replacement barrel. I would contact them in any case about inspecting the firearm under warranty if the ammunition you were firing was new manufactured.

These people list the barrel:

 

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Never had a problem with my 9mm version and have never heard of that happening. You know they have a warranty dont you? If the barrel material is at fault they should replace it, but it sounds like overloaded ammo to me
 

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Discussion Starter · #5 ·
Some.40 S&W barrels have an unsupported base. It's a known problem with Glock pistols. Not sure about the S&W barrel feed profile. If the swelling of the brass was beyond the feed ramp area, this is a sign of serious overpressure.

Where did your .40 S&W rounds come from? Barrels should be pretty strong, and swelling indicates a very dangerous situation. Typically this can happen with improperly hot reloads, but was this factory ammunition? If so, what kind.

Personally, I would not shoot it if you have more of the same.

Firearms are proof fired in the final steps of manufacture. I'd be surprised if a barrel that wasn't properly manufactured survived that.

In any case, S&W is likely our only source for this replacement barrel. I would contact them in any case about inspecting the firearm under warranty if the ammunition you were firing was new manufactured.

These people list the barrel:

Its swelling is right in front of the feed ramp. Not anywhere else. It was Winchester ammo. I noticed it got really Hot. I thought the frame was gonna melt.
 

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Would really love to see some pictures of the brass and the barrel to see what you are talking about and offer help.


Lost in the woods... Hopefully.
 

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Welcome to the forum!
 

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Not even going there except to say, no firearm can stand up to 150 consecutive firings in quick succession without allowing for the barrel to cool down without something detrimental happening.

I'd never ever do that. Your post Number 5 kind of explains the issue.
 

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Not even going there except to say, no firearm can stand up to 150 consecutive firings in quick succession without allowing for the barrel to cool down without something detrimental happening.

I'd never ever do that. Your post Number 5 kind of explains the issue.
But its a hand gun so unless you have 10 loaded magazines there would be time for it to cool while refilling the mags, not to mention the time to drop and load a new magazine. The gun comes with 2, not like its a machine gun or bump stock
 

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That bulge in the brass is typical of .40 S&W in some handguns. It happens in Glocks too, because of the lack of support of the chamber during extraction. The firearm is already extracting before the bullet has exited the barrel and the pressure drops. It could well be a timing problem, the wrong recoil spring or potentially a breech lock issue.

If the barrel is overheating, this will slow the bullet's travel down the barrel, and allow extraction to happen prior to the bullet exiting, meaning high pressure is still pushing against the walls of the cartridge case when things are unlocked.

I'd double check the condition of the barrel, ensure that the gun is clean and ensure that the correct recoil spring is in the gun (not one for 9mm Luger).

Marc
 

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But its a hand gun so unless you have 10 loaded magazines there would be time for it to cool while refilling the mags, not to mention the time to drop and load a new magazine. The gun comes with 2, not like its a machine gun or bump stock
He stated the 'frame was hot...."I noticed it got really Hot. I thought the frame was gonna melt." That is too hot least in my view it is. I've never shot any of my firearms until the frames got hot. My barrels get hot, well warm on my magnum rifles when building loads and when they heat up, I stop and let them cool down. Barrels do funny things when they get that hot. If the frame was that hot, imagine how hot the barrel was....

Not here to joust about it. Something is fishy, what it is, I have no idea. I'll let you guys carry on.
 
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