Pukker Factor 12 on the sphincter scale

Jan 2009
1,684
0
s. greenlake *****
dude.. thats bullshit..

I noticed he was pulling those dead rounds out pretty quick.. I like to wait a few seconds before pulling a dud round out.. you never can tell.

either way. Scary!
 
Jan 2009
152
0
Bellevue
Why did it do that? He inserted a fresh mag after having ejected the previous round. The fresh mag then detonated with the first shot... :hmmmm2:

-Guff
 
Jan 2009
370
0
Washington
Squib load. Probably an over-charged reload.

What a moron. And you don't need to use the feed-assist like that. He was slapping it like a f*cking retard.

He should not be allowed to use a gun until he knows what the f*ck he is doing.
 
Jan 2009
371
0
Washington on the wet side
i think he had a squib shot that lodged in the barrel
and basically the forward assist was pushing the stuck bullet deeper so the round would correctly chamber and ignite
Fortunately if that was the case the obstruction caused the detonation of the round to exit out of the path of least resistance which was the mag well
If the squib would have stuck mid barrel it woulda been nastyer
at least that is my understanding of how it could happen
 
Mar 2009
13
0
Enumclaw, WA
That was caused by the bullet being pushed deeper into the case upon feeding. The 55 grain bullets are not so bad for it--the 62 grain bullets will do it in a heartbeat, because you have to seat them almost to the ogive to achieve the proper OAL. The Lee Factory Crimp die is your friend.
 
Jan 2009
254
0
Ltown, WA
Old video..

That was caused by the bullet being pushed deeper into the case upon feeding. The 55 grain bullets are not so bad for it--the 62 grain bullets will do it in a heartbeat, because you have to seat them almost to the ogive to achieve the proper OAL. The Lee Factory Crimp die is your friend.


What now? Your thinking from the higher pressure from the bullet being seated too far blew it apart?
 
Mar 2009
13
0
Enumclaw, WA
1. Seating the 62 gr. M855 bullet--or any other bullet of the same weight or profile--in the .223/5.56 case WILL cause a severe pressure spike. Seating deeper by only a small amount can cause pressure to spike to well over 150,000 c.u.p. This will cause the case to rupture just forward of the web.

2. The Lee FCD is cheap insurance to get a superior crimp applied, regardless of case length. It will not buckle cases, nor case shoulders.
 
Jan 2009
254
0
Ltown, WA
I shoot 69gr out of my .223/5.56 with no problems. Tried alot of seat depths also with no problems.. There was more issues than that in this vid.
 
Mar 2009
307
0
why you asking b ?
maybe he was shooting a nato round in a non rated nato upper? (if you dont know the difference google it cause it would take to long to explain)
 
Mar 2009
13
0
Enumclaw, WA
I shoot 69gr out of my .223/5.56 with no problems. Tried alot of seat depths also with no problems.. There was more issues than that in this vid.

If you reload, no doubt these rounds are seated to the proper OAL, with a good crimp; and they're fired in a rifle with the proper feed ramp configuration out of good magazines.

Shooting the heavy bullet .223/5.56's are no problem at all--but when you go out of tolerance on any one of the factors you open the door to a host of potential problems--and the .223/5.56 can be REAL unforgiving. Just like .40 S&W--it's a high pressure cartridge and any problems can be devastating.
 
Jan 2009
745
0
Dri-Shities
Ok, I don't get it?

I've read all of these theories & have a couple of questions.

On a locking rotating bolt gun, isn't the only way this could occur is if the gun somehow fired without the bolt locked into firing position?

If the bolt was locked into the breach, wouldn't the only way for the bullet & gasses to escape be through the barrel?
 
Jan 2009
371
0
Washington on the wet side
thats my squib theory
handloads
one didnt get full of powder caused a squib
squib put all the pressure back through the bolt causing it to esplode through path of least resistance
magwell = least resistance
 
Mar 2009
13
0
Enumclaw, WA
Definitely not a squib. Had it been a squib, the barrel would have been destroyed at the point of obstruction.

As to how this can happen with a locking, rotating bolt, it's easy: Remember the system of operation of the AR/M16 family. When the cartridge is fired, at a certain point in the bore (in this case, near the muzzle) the bullet passes a gas port. The expanding gases head into the port, down the gas tube and into the bolt carrier key.

(Bullet is still in the bore.)

The gases, still coming back with full force and pressure, head down the carrier key and into the back of the bolt carrier--into the small space between the back of the bolt and the bottom of the bolt carrier. This gas is still under pressure, so it gets packed into that small space. Now, something has to give--in this case the carrier starts sliding backward.

(Bullet is now exiting muzzle. Gas pressure is now dropping at a REALLY fast rate.)

The carrier's rearward travel causes the cam pin--which is anchored solidly through the bolt--to rotate, taking the lugs out of engagement. Now, the bolt carrier is still traveling rearward under a bit of pressure--which is vented through the two holes in the right side of the carrier.

(Rifle is now completely unlocked. Pressure has dropped to zero. Something is in the process of getting acquainted with a 5.56mm bullet moving REALLY fast.)

The potential energy of the expanding gas has now been converted completely into kinetic energy. The bolt carrier group moves backward under that energy extracting and ejecting the brass. The kenetic energy of the fired round has now been overcome by the resistance of the recoil spring in the buttstock; the BCG now moves forward; feeding, chambering and locking again in preparation for the next shot.

So, what happens when all of the above takes place with a long bullet that has been jammed back into the case upon feeding?

Remember that the case is a pressure vessel--when you decrease the amount of space inside then the same amount of gas will produce a much higher pressure. In this example, all of the above occurs--but the gas hitting that BCG has TRIPLED in pressure. Oh yeah, it's going to unlock--HARD. That carrier will come roaring back. Fortunately, there's a vent there--the mag well. All of the excess gas will head straight down that mag well. Yes, you'll get an ouch--but with a properly manufactured rifle you may well be OK. If you are stuck with an inferior or flawed bolt or bolt carrier, the metal might shatter like glass. NOW you have serious problems.

Hope that all helped, folks! :hello:
 
Mar 2009
307
0
why you asking b ?
This all assuming that they were using reloads?
I have seen somewhere around 90million 5.56 rounds fired in the marine corps and never seen that one but i know crazy **** happens at an instance
 
Jan 2009
745
0
Dri-Shities
This all assuming that they were using reloads?
I have seen somewhere around 90million 5.56 rounds fired in the marine corps and never seen that one but i know crazy **** happens at an instance

In the video they were talking about doing a shitty job reloading the rounds.
 
Mar 2009
307
0
why you asking b ?
ah missed that part, but to go along with powderman, i have seen a bolt action bolt explode in a guys face, cutting him badly all over the face, and i was 6 lanes down from him and some how just happened to glance over at the right time to see it happen, scary. I think it was an old mosin nagant the range master took the rifle to have it looked at
 
Mar 2009
86
0
Seattle, WA
Revision Sawfly is always protecting my eyes while shooting. Wonder if they decide to design the Ar15/M16 to blow up on just the right side in the event that it does explode for safety reasons.
 
Jun 2009
32
0
washington
deffinetly squib

Best way to to tell, listen to the report off the last shot before the squib issue, bang bang pfft tap rack boom. After that very low pressure report he shoulda check the bore foe blockage not just the chamber. Just goes to show you that you have to be completly aware of all that happens when you go shooting. Responsibility keeps us all safe.
 
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