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Posted: 4/18/2017 12:08:24 PM EST
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 12:10:22 PM EST
Link Posted: 4/18/2017 12:11:28 PM EST
You serious?
Link Posted: 4/18/2017 12:12:34 PM EST
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 12:12:44 PM EST
It gets very cold when firing and it will form ice that bends the barrel.
Link Posted: 4/18/2017 12:13:07 PM EST
You've been here 16 years. 16.
Link Posted: 4/18/2017 12:13:20 PM EST
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Originally Posted By ranging-by-zipcode:
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 12:13:32 PM EST
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Originally Posted By ranging-by-zipcode:
It gets very cold when firing and it will form ice that bends the barrel.
View Quote
Thus the insulated gloves in the barrel bag. Prevents frostbite. 
Link Posted: 4/18/2017 12:14:16 PM EST
And then the front just drops the fuck off!
Link Posted: 4/18/2017 12:14:16 PM EST
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 12:14:52 PM EST
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Originally Posted By cpl0313:
Thus the insulated gloves in the barrel bag. Prevents frostbite. 
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Link Posted: 4/18/2017 12:15:32 PM EST
Originally Posted By yobo:
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 12:16:08 PM EST
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 12:17:01 PM EST
We need more water cooled machine gun pics in this thread.
Link Posted: 4/18/2017 12:20:07 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ranging-by-zipcode:
It gets very cold when firing and it will form ice that bends the barrel.
View Quote

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 12:21:44 PM EST
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 12:22:13 PM EST
[Last Edit: 4/18/2017 12:23:20 PM EST by CONKLE73]
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 12:23:29 PM EST
In before "not sure if serious" meme....
Link Posted: 4/18/2017 12:24:23 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Fugitive:

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!"
View Quote
This is how 9/11 happened.
Link Posted: 4/18/2017 12:25:11 PM EST
01ers.
Link Posted: 4/18/2017 12:25:57 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By peekay:

This is how 9/11 happened.
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TRUTHER!
Link Posted: 4/18/2017 12:26:22 PM EST
Piss on it!
Link Posted: 4/18/2017 12:27:21 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By CONKLE73:
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 12:27:45 PM EST
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 12:27:46 PM EST
I wish I had a MG so I could ruin barrels
Link Posted: 4/18/2017 12:28:39 PM EST
I got nothing.
Link Posted: 4/18/2017 12:28:46 PM EST
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Originally Posted By Jeremy2171:
and it creates fruit plates x87
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View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Jeremy2171:
Originally Posted By ranging-by-zipcode:
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 12:29:43 PM EST
Link Posted: 4/18/2017 12:29:54 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Fugitive:

TRUTHER!
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Barrels are steel. Bullets make fire. Therefore, bullets brought down the towers.
Link Posted: 4/18/2017 12:30:46 PM EST
Heat (as in very hot) how does it work?
Link Posted: 4/18/2017 12:32:09 PM EST
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 12:33:18 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By peekay:
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 12:34:14 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By peekay:

This is how 9/11 happened.
View Quote
Attachment Attached File
Link Posted: 4/18/2017 12:36:01 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Fugitive:

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 12:36:36 PM EST
wrap the barrel in bacon and cook it off.
Link Posted: 4/18/2017 12:38:20 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By peekay:

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 12:39:08 PM EST
Two words: Jet Fuel Bullets.
Link Posted: 4/18/2017 12:40:08 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Fugitive:

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 12:40:39 PM EST
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Originally Posted By peekay:
Those mother fuckers!
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Had to CYA and lied about it.
Link Posted: 4/18/2017 12:40:55 PM EST
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 12:43:05 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By WhatsGnu:
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 12:44:07 PM EST
The hot side stays hot and the cool side stays cool.
Link Posted: 4/18/2017 12:51:08 PM EST
Just have a guy pour Valvoline all over it as you shoot.  

...or was it Quaker State?
Link Posted: 4/18/2017 12:52:10 PM EST
I like this thread..
Link Posted: 4/18/2017 12:56:46 PM EST
Link Posted: 4/18/2017 12:58:16 PM EST
Link Posted: 4/18/2017 1:00:14 PM EST
Link Posted: 4/18/2017 1:19:05 PM EST
[Last Edit: 4/18/2017 1:19:35 PM EST by brickeyee]
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 1:21:40 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By brickeyee:
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.
View Quote
Then you can shoot around corners!
Link Posted: 4/18/2017 1:23:27 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By WhatsGnu:
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.
View Quote
No way! Just run belts with all tracers and you'll be OK!
Link Posted: 4/18/2017 1:25:47 PM EST
[Last Edit: 4/18/2017 1:26:54 PM EST by PanzerOfDoom]
Krauts used turtles to cool their MG42 barrels, they ran out of turtles and lost the war.
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