Cook-off temperature? > AR Discussions

Posted: 7/31/2006 3:58:53 PM EDT

Out of curiosity, at what temp (approx.) will most ammo cookoff?

- Matt

Posted: 7/31/2006 6:11:39 PM EDT

[#1]

450-500F

Posted: 7/31/2006 6:15:24 PM EDT

[#2]

I saw a study where an M1A was fired one round per second and didn't start having cook-offs until well over 2,000 rounds. Thought it was kinda interesting.....

Posted: 7/31/2006 6:26:42 PM EDT

[#3]

Quoted:
I saw a study where an M1A was fired one round per second and didn't start having cook-offs until well over 2,000 rounds. Thought it was kinda interesting.....

well thats because it was a piston upper

i mean it would of have to been to go 2k without haveing to be completely rebuilt

that is what like every third or fourth person here says anyway

but then every thrid or fourth person is probably the same person

during caseless ammo development this became a biut of an issue and the above post is pretty spot on

400+ it is a concern and 450 it is most likely going to happen

depends on how long the soak time and stat temps are

in spite of htip and sis work the primer is what pops and is the current ceiling

Posted: 7/31/2006 6:40:49 PM EDT

[#4]

Quoted:
in spite of htip and sis work the primer is what pops and is the current ceiling

Something just popped in my head...

Posted: 8/1/2006 1:45:36 AM EDT

[#5]

"Firing 140 round rapidly and continuously will raise the temperature of the barrell to the cook off point."

or so sayeth the TM-9.

The 400-500 degree stated is probably pretty close.

Joe

Posted: 8/1/2006 8:56:31 AM EDT

[#6]

add quite a bit more to whatever the TM says. 140 rounds continuously and rapidly is thier definition of a hot gun. there is a big safety margin built in. my estimate is more like 200 rounds.

Posted: 8/1/2006 9:01:35 AM EDT

[#7]

I once cooked off a Chinese 7.62x39 with 300-325 deg F of heat.

Posted: 8/1/2006 9:05:15 AM EDT

[#8]

Quoted:
I once cooked off a Chinese 7.62x39 with 300-325 deg F of heat.

...what, did you just stick it in the oven to see what would happen?

Posted: 8/1/2006 9:54:56 AM EDT

[#9]

Quoted:

Quoted:
in spite of htip and sis work the primer is what pops and is the current ceiling

Something just popped in my head...

Don't know what sis is but HITP = High Ignition Temperature Propellant. he's saying they've got powder that doesn't cookoff but it does you no good if the primer cooks off and ignites it anyway.

Posted: 8/1/2006 10:02:49 AM EDT

[#10]

While looking for some more detailed info I found this posted on another board but no additional reference for the info was provided:

The interesting test is the cookoff test. One shot per second for 500 seconds. On mag rifles during magazine change of course they lose a couple seconds and they speed up to catch up to the sequence of one per second.
Thermocouples are placed on the barrel. ON the M16 barrel temps got to circa 450 deg F and the 501st round is chambered and the stop watch is started. Cookoff was achieved in 8 seconds if memory serves me correctly.

Posted: 8/1/2006 10:44:07 AM EDT

[#11]

Quoted:

Quoted:
in spite of htip and sis work the primer is what pops and is the current ceiling

Something just popped in my head...

Don't know what sis is but HITP = High Ignition Temperature Propellant. he's saying they've got powder that doesn't cookoff but it does you no good if the primer cooks off and ignites it anyway.

Yes, he sent me an IM and explained that. I asked about sis, no reply yet. Interesting information, though.

Posted: 8/1/2006 11:20:31 AM EDT

[#12]

1 30 rd mag dump in my M16 = a bbl. WAY to hot to touch...

Posted: 8/1/2006 11:28:48 AM EDT

[#13]

On a similar note.. what is the cookoff temperature for stupid threads?

Posted: 8/1/2006 11:53:57 AM EDT

[#14]

Quoted:

Quoted:
in spite of htip and sis work the primer is what pops and is the current ceiling

Something just popped in my head...

Don't know what sis is but HITP = High Ignition Temperature Propellant. he's saying they've got powder that doesn't cookoff but it does you no good if the primer cooks off and ignites it anyway.

Yes, he sent me an IM and explained that. I asked about sis, no reply yet. Interesting information, though.

sorry

in house contraction for sbir info system

you probably know it as sitis

sbir interactive technical information system

(dtic)

did not mean to confuse

Posted: 8/1/2006 3:25:52 PM EDT

[#15]

Quoted:
On a similar note.. what is the cookoff temperature for stupid threads?

Why don't you go find one of the many threads that -are- worthless and let us know?

Posted: 8/1/2006 5:12:09 PM EDT

[#16]

Quoted:
While looking for some more detailed info I found this posted on another board but no additional reference for the info was provided:

The interesting test is the cookoff test. One shot per second for 500 seconds. On mag rifles during magazine change of course they lose a couple seconds and they speed up to catch up to the sequence of one per second.
Thermocouples are placed on the barrel. ON the M16 barrel temps got to circa 450 deg F and the 501st round is chambered and the stop watch is started. Cookoff was achieved in 8 seconds if memory serves me correctly.

But do you know how hot was the round when it went off? Not to nitpick, I just would like to know.

Posted: 8/2/2006 4:41:07 AM EDT

[#17]

Quoted:
On a similar note.. what is the cookoff temperature for stupid threads?

Sorry, I never got to take my 'advanced cook-off dangers' class in school. But seeing as it could possibly prevent a fatal accident (or keep me from looking like an idiot at the range), I don't mind spending a few minutes.

I can see you are looking to get back to your very old style of irritating comments to get attention. Spare us, please.

Posted: 8/2/2006 4:10:33 PM EDT

[#18]

height=8

Quoted:
On a similar note.. what is the cookoff temperature for stupid threads?

Sorry my threads do not meet your exacting standards. hould

Thanks for the info guys.

- Matt

Posted: 8/2/2006 5:09:07 PM EDT

[#19]

LMAO, everytime I look at MarkM's bio pic I can't help but think of a guy driving a beat up Firebird, listening to Pantera while on his way to his job as Manager of a fastfood resturant... The Mullet is awesome I might add. Makes me want one!

Does MarkM even own an AR?

- Clint

Posted: 8/2/2006 6:05:34 PM EDT

[#20]

I've fired 8 30 round mags, full auto, back to back and never had a cook off. It was so hot I could barely hold onto the pistol grip let alone the hand guards. This was early 80s with a M16A1.

Posted: 8/4/2006 9:25:43 PM EDT

[#21]

my understanding is that modern powders will set off around the 380f temp range, requiring a probable barrel temp of about 450f+ to get it up there; how long it would take for a fresh round to sit in such a chamber before it hits that temp i don't know.

Posted: 8/5/2006 6:23:46 AM EDT

[#22]

I've dumped 3 thirty rounders in a row without a cookoff.

And let me tell ya, the barrel was nuclear type hot!

Couldn't hang onto the free float, alum, quad rail.

Check this site out, www.gunsmokeenterprises.net/click on the torture test. Guy shoots 1100 rounds in something like 15 minutes w/o a cookoff. Makes you want a full auto.

Posted: 8/5/2006 7:35:20 AM EDT

[#23]

This is my 2 cents for what ever you all might think it's worth.

Cook off temp is 1375 and that's striaght from the word of COLT.

So dont shoot the messanger, argue with them.

Pat

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