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Posted: 3/13/2005 5:50:59 PM EDT
[#1]
Was it a reload?
What is the headstamp? |
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Posted: 3/13/2005 5:57:56 PM EDT
[#2]
Yep,a reload that I'd worked up to carefully,well under max and I'd shot close to 1000 of. virgin WW brass. If you look closely at the pics you can see where the case is tweaked and collapsed. I'd had feeding problems with that magazine before and have new springs and followers ordered,hoping to fix it. I should have just put it away.Too late!
NW |
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Posted: 3/13/2005 5:58:17 PM EDT
[#3]
The web area of the brass looks awful strange. What happened?
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Posted: 3/13/2005 5:58:27 PM EDT
[#4]
It's a little hard to tell from the photos; has the shoulder of that case been pushed forward at all? It really doesn't look like it has. If the shoulder has not moved, that suggests that the case was indeed fully chambered at time of firing, but either the chamber didn't fully support the case head, or the primer was ignited before the bolt could rotate into position.
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Posted: 3/13/2005 6:09:19 PM EDT
[#5]
If it was a reload, it may have had a high primer and set off before the shell was fully in the chamber. |
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Posted: 3/13/2005 6:18:58 PM EDT
[#6]
I suggest you post this is 'troubleshooting' so Tweak and other resident experts are sure to see it.
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Posted: 3/13/2005 8:48:33 PM EDT
[#7]
whoa
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Posted: 3/13/2005 8:51:42 PM EDT
[#8]
so this was the thread about me no longer using my mag well as a vfg!
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Posted: 3/13/2005 9:21:25 PM EDT
[#9]
Glad to see you didn't get hurt too bad. Alot worse can happen.
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Posted: 3/13/2005 9:29:21 PM EDT
[#10]
Damn! Glad you are OK.
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Posted: 3/13/2005 10:01:22 PM EDT
[#11]
Take your gun apart. Study how the bolt/firing pin work in combination. Notice how the firing pin can not protrude if the bolt is not back in position and full locked in the lugs, A AR/M16 can not fire out of battery, it can of course detonate from faulty ammunition. You virtually can not undercharge a .223 case with rifle powder because it will spill out the top. Buy you can under drop the powder and this can cause an explosion as the primer detonates the small amount of loose powder all at onces rather than a progressive burn from front to back of the powder in the case slowly building pressure.
Bad ammo that is what you have experienced, faulty case or one loaded too many times, or a kaboom cause by an undercharge. |
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Posted: 3/13/2005 10:13:02 PM EDT
[#12]
High primer?
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Posted: 3/13/2005 11:27:03 PM EDT
[#14]
Ammo can get a lot worse than what you had.
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Posted: 3/14/2005 2:11:08 AM EDT
[#15]
Did you crimp the bullets in place. I was firing some win white box h.p. the other day. fired one shot, something felt strange. 2nd round never chambered, looked like empty brass in the mag.Dropped the mag , looked through barrel which is clear, and then notived the round had been caught in the mag , pushing the bullet, way up in the casing. only about 1/8 inch sticking out og case. i went to the house and factory crimped the remaining rounds. Maybe what happened with yours.
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Posted: 3/14/2005 3:18:46 AM EDT
[#16]
That blown case looks an awful lot like the primer went BEFORE the case was fully in the chamber. That web-area expansion looks amazingly like the space in the barrel extension where the bolt's locking lugs go. However, the bolt slapping the primer out of battery would not have left an indent on the primer, no would it.
How does the bolt look? Is the firing pin hole still clear and circular? How were you firing when this happened-slow fire or popping them off pretty fast? |
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Posted: 3/14/2005 4:37:21 AM EDT
[#17]
It definatley looks like that round somehow fired out of battery.
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Posted: 3/14/2005 7:51:09 AM EDT
[#18]
Yup. Seeing as it was a reload, could very easily have been a brass issue. The AR pretty much CAN'T fire out of battery, but used/stressed brass can fail in just this specific area, in just this specific manner. The path or least resistance for the hot gasses is definately up the bore behind the bullet, unless there is a problem with the web of the brass, which is arguably the strongest part of the case, seeing as it does not get any direct support either from the bolt or the chamber walls. How many loads, and how hot, on this lot of brass? Also, undercharging of powder will detonate(instead of burn progressively) and the cases will look similar. What are your loading/powder charging methods? What kind of equipment do you use? Have a powder check die on a progressive or physically look at each and every case before seating a bullet. Tom 
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Posted: 3/14/2005 8:13:20 AM EDT
[#19]
Those pictures remind me what happened to my buddy last year. He was training before match with S&B factory ammo and was scared shitless when he had similar KB. Results:
    MN |
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Posted: 3/14/2005 8:17:26 AM EDT
[#20]
high primer?
Dont you just love reloads. |
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Posted: 3/14/2005 8:23:07 AM EDT
[#21]
this makes me nervous cause I shoot reloads 99% of the time
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Posted: 3/14/2005 8:27:17 AM EDT
[#22]
Uh-Huh! 
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Posted: 3/14/2005 10:10:46 AM EDT
[#24]
Although the AR shouldn't be sensitive to this, you might want to use a mil-spec primer if you're not already. The stock AR's got plenty of hammer and spring tension to support this.
I agree that the case appears to have fired out of battery. Did the k-b happen when you pulled the trigger, or was it before you got to pull the trigger? Did you pull the trigger, get a round off and perhaps this happened without your further input on cycling? Sure looks like the result of a slamfire to me, but... who can say... Note - if your action somehow had the oomph to crush the case OR if you had a head problem when it chambered, the case volume difference might have been enough to cause a pressure spike - ESP if your bullet took the lands wrong which it may well have. Thank your AR, too. A lesser arm might have had you in the hospital. |
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Posted: 3/14/2005 10:42:56 AM EDT
[#25]
I'm with David. I think it's bad ammo.
Sorry for your misfortune, NorWester. But thanks for posting with pics. Sam |
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Posted: 3/14/2005 5:18:37 PM EDT
[#26]
Reloads. It's always reloads! I am a hard core, dyed in the wool reloader, but I won't reload for any autoloader. I had a slam fire with some very carefully prepared M1 carbine reloads and that's the end of that. Based on all the kabooms that I've read about, it seems that: 1. These guns appear to be firing out of battery. 2. These guns don't tolerate reloads the way a bolt action will. |
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Posted: 3/14/2005 5:20:02 PM EDT
[#27]
50,000 psi makes brass flow like putty |
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Posted: 3/14/2005 5:32:27 PM EDT
[#28]
Great, now you have me scared to start reloading for my AR
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Posted: 3/14/2005 6:35:41 PM EDT
[#29]
I don't think it's a matter of being scared, it's a matter of playing the percentages. Over the years, I have seen a lot of these slam fires or whatever they are reported and it seems like a reload is involved 95% of the time. Also, it seems like most kabooms are autoloaders firing out of battery. I like reloading, but 223 ammo is cheap enough anyway. |
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Posted: 3/14/2005 6:45:39 PM EDT
[#30]
Yep reloads cause 98% of kabooms. I reload I had it happen it took 10,000 rounds to do it but it happened.
With any sport its not a matter of if, but when you will have a kaboom. sooner or later you will mess up. |
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