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Posted: 4/18/2017 1:08:24 PM EDT
I was watching a video of a guy shooting a MG-42 machine gun and he was saying how the gunner must shoot short burst and change/rotate the barrel every 120 rounds (I think he said 120 rounds) or so to prevent barrels from getting "shot out".  
Just exactly how does the machines gun barrel get shot out or damaged from prolonged shooting?  I know it gets very hot and heat damages metal but how exactly does it damage the barrel? Does the rifling get worn out?  Does the barrel bend?  What would happen if he lets loose with couple hundred rounds in one long burst?
Link Posted: 4/18/2017 1:10:22 PM EDT
Link Posted: 4/18/2017 1:11:28 PM EDT
You serious?
Link Posted: 4/18/2017 1:12:34 PM EDT
Yes
yes
 and see above. 

It it takes more than 200 rounds at cyclic rate to damage the barrel.

When in doubt, go cyclic!  
Link Posted: 4/18/2017 1:12:44 PM EDT
It gets very cold when firing and it will form ice that bends the barrel.
Link Posted: 4/18/2017 1:13:07 PM EDT
You've been here 16 years. 16.
Link Posted: 4/18/2017 1:13:20 PM EDT
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Quoted:
It gets very cold when firing and it will form ice that bends the barrel.
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and it creates fruit plates x87
Link Posted: 4/18/2017 1:13:32 PM EDT
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Quoted:
It gets very cold when firing and it will form ice that bends the barrel.
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Thus the insulated gloves in the barrel bag. Prevents frostbite. 
Link Posted: 4/18/2017 1:14:16 PM EDT
And then the front just drops the fuck off!
Link Posted: 4/18/2017 1:14:16 PM EDT
The hotter the barrel the more damage it takes from the rounds going down, once the rifling is worn away it is 'shot out', the diameter of the barrel being larger than the diameter of the projectile.  Every 120 rounds is excessive, I believe that it is not round count dependent.  More along the lines of how fast you have been running the gun.  Nobody is going to stop in the middle of the belt to change barrels, anyway.  200rds on a belt as I recall, plus or minus.
Link Posted: 4/18/2017 1:14:52 PM EDT
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Quoted:
Thus the insulated gloves in the barrel bag. Prevents frostbite. 
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Link Posted: 4/18/2017 1:15:32 PM EDT
Quoted:
I was watching a video of a guy shooting a MG-42 machine gun and he was saying how the gunner must shoot short burst and change/rotate the barrel every 120 rounds (I think he said 120 rounds) or so to prevent barrels from getting "shot out".
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I must be doing it wrong.
Link Posted: 4/18/2017 1:16:08 PM EDT
I saw an 11Bush shoot out the rifling of a M-2 at Baumholder.  He had linked several belts together and held down the butterfly.  The barrel got so hot that towards the end you could see the bullets moving down the barrel. When they came out, they sort of wobbled down range.  In addition to whatever other punishment he got, his Plt. Sgt. made him walk ~15miles back to garrison carrying that red (by then) hot barrel.
Link Posted: 4/18/2017 1:17:01 PM EDT
We need more water cooled machine gun pics in this thread.
Link Posted: 4/18/2017 1:20:07 PM EDT
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Quoted:
It gets very cold when firing and it will form ice that bends the barrel.
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Yeah! Science bitch!
Actually, as the barrel heats up, condesation takes place.  This raises chamber pressure and forces water molecules into the steel.  Accelerated rusting takes place and the barrel eats itself.  First discovered by JMB, its called the Browning effect although Maxim claims to have seen it first. Using a glove was first recommended by PFC Homer Knutson who is famously quoted as saying, "Fuck that's hot!"
Link Posted: 4/18/2017 1:21:44 PM EDT
Because the hotter the barrel is, the softer the barrel steel becomes.


Firing at the cyclic rate on a very hot barrel is going to erode more of the throat, per shot, than firing the same number of rounds at the same rate through a cooler barrel.
Link Posted: 4/18/2017 1:22:13 PM EDT
Well... the MG42 is an old machine gun and back then the Germans added a high chocolate content to the chemical make-up of the steel and, well, you know what happens to a chocolate bar when you keep it in your pocket too long...
Recent advancements in candy coating technology protects the chocolate in the steel from melting away under the heat produced by longer sustained rates of fire... so it's not as much of a concern now.
Link Posted: 4/18/2017 1:23:29 PM EDT
In before "not sure if serious" meme....
Link Posted: 4/18/2017 1:24:23 PM EDT
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Quoted:

Yeah! Science bitch!
Actually, as the barrel heats up, condesation takes place.  This raises chamber pressure and forces water molecules into the steel.  Accelerated rusting takes place and the barrel eats itself.  First discovered by JMB, its called the Browning effect although Maxim claims to have seen it first. Using a glove was first recommended by PFC Homer Knutson who is famously quoted as saying, "Fuck that's hot!"
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This is how 9/11 happened.
Link Posted: 4/18/2017 1:25:11 PM EDT
01ers.
Link Posted: 4/18/2017 1:25:57 PM EDT
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Quoted:

This is how 9/11 happened.
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TRUTHER!
Link Posted: 4/18/2017 1:26:22 PM EDT
Piss on it!
Link Posted: 4/18/2017 1:27:21 PM EDT
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Quoted:
Well... the MG42 is an old machine gun and back then the Germans added a high chocolate content to the chemical make-up of the steel and, well, you know what happens to a chocolate bar when you keep it in your pocket too long...
Recent advancements in candy coating technology protects the chocolate in the steel from melting away under the heat produced by longer sustained rates of fire... so it's not as much of a concern now.
View Quote
That's why an super accurate barrel is called 'A Sweet Shooter'.
Link Posted: 4/18/2017 1:27:45 PM EDT
Throat erosion from gas checking, exacerbated by increased chamber temp.

MG42 has a way higher cyclic rate than any other belt-fed GPMG that I know of, so barrel changes are required more frequently.
Link Posted: 4/18/2017 1:27:46 PM EDT
I wish I had a MG so I could ruin barrels
Link Posted: 4/18/2017 1:28:39 PM EDT
I got nothing.
Link Posted: 4/18/2017 1:28:46 PM EDT
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Quoted:
and it creates fruit plates x87
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Quoted:
Quoted:
It gets very cold when firing and it will form ice that bends the barrel.
and it creates fruit plates x87
.
Link Posted: 4/18/2017 1:29:43 PM EDT
Link Posted: 4/18/2017 1:29:54 PM EDT
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Quoted:

TRUTHER!
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Barrels are steel. Bullets make fire. Therefore, bullets brought down the towers.
Link Posted: 4/18/2017 1:30:46 PM EDT
Heat (as in very hot) how does it work?
Link Posted: 4/18/2017 1:32:09 PM EDT
Talking about "Fuck, that's hot", a fellow knife maker told me that when a knife comes out of the oil quench, if the knife is still around 500-700 degrees, you can use thick welder's gloves to bend any minor warps out of the blade.  I asked how thick the gloves needed to be, and his response was, "Oh, you will know right away whether they were thick enough or not".   He was right.
Link Posted: 4/18/2017 1:33:18 PM EDT
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Quoted:
Barrels are steel. Bullets make fire. Therefore, bullets brought down the towers.
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Makes about a smuch sense as nano-thermite, shaped charges and cruise missles.
Link Posted: 4/18/2017 1:34:14 PM EDT
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Quoted:

This is how 9/11 happened.
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Attachment Attached File
Link Posted: 4/18/2017 1:36:01 PM EDT
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Quoted:

Makes about a smuch sense as nano-thermite, shaped charges and cruise missles.
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The cruise missiles that hit the Pentagon?
Link Posted: 4/18/2017 1:36:36 PM EDT
wrap the barrel in bacon and cook it off.
Link Posted: 4/18/2017 1:38:20 PM EDT
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Quoted:

The cruise missiles that hit the Pentagon?
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I thought so, but maybe some guys in the Pentagon were fucking around with a machine gun and forgot to switch barrels and started a chain reaction.
Link Posted: 4/18/2017 1:39:08 PM EDT
Two words: Jet Fuel Bullets.
Link Posted: 4/18/2017 1:40:08 PM EDT
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Quoted:

I thought so, but maybe some guys in the Pentagon were fucking around with a machine gun and forgot to switch barrels and started a chain reaction.
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Those mother fuckers!
Link Posted: 4/18/2017 1:40:39 PM EDT
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Quoted:
Those mother fuckers!
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Had to CYA and lied about it.
Link Posted: 4/18/2017 1:40:55 PM EDT
And a bunch of tracer rounds in the mix will really add to the heat.
Not to mention set brush and grass on fire. Sucks to be downrange for any of that.
Link Posted: 4/18/2017 1:43:05 PM EDT
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Quoted:
And a bunch of tracer rounds in the mix will really add to the heat.
Not to mention set brush and grass on fire. Sucks to be downrange for any of that.
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lol snark!  
Link Posted: 4/18/2017 1:44:07 PM EDT
The hot side stays hot and the cool side stays cool.
Link Posted: 4/18/2017 1:51:08 PM EDT
Just have a guy pour Valvoline all over it as you shoot.  

...or was it Quaker State?
Link Posted: 4/18/2017 1:52:10 PM EDT
I like this thread..
Link Posted: 4/18/2017 1:56:46 PM EDT
Link Posted: 4/18/2017 1:58:16 PM EDT
Link Posted: 4/18/2017 2:00:14 PM EDT
Link Posted: 4/18/2017 2:19:05 PM EDT
Steel under load starts to bend when it is not all that hot.

At an intense red glow in the middle of a 36 inch long 1/2 inch diameter drill rod and it will

bend to 90 degrees under its own weight.

Rifling?

We don't need no damn rifling.
Link Posted: 4/18/2017 2:21:40 PM EDT
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Quoted:
Steel under load starts to bend when it is not all that hot.

At an intense red glow in the middle of a 36 inch long 1/2 inch diameter drill rod and it will

bend to 90 degrees under its own weight.

Rifling?

We don't need no damn rifling.
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Then you can shoot around corners!
Link Posted: 4/18/2017 2:23:27 PM EDT
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Quoted:
And a bunch of tracer rounds in the mix will really add to the heat.
Not to mention set brush and grass on fire. Sucks to be downrange for any of that.
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No way! Just run belts with all tracers and you'll be OK!
Link Posted: 4/18/2017 2:25:47 PM EDT
Krauts used turtles to cool their MG42 barrels, they ran out of turtles and lost the war.
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