MAJOR kaboom...

[wetidlerjr]

MAJOR kaboom !

[mhanna91]

So they attributed this to the case not being crimped to the projectile properly? I don't crimp my reloads at all. Should I re-think this?

[MAUSER202]

I am not buying the bullet set back theory, the way that split looks more like a barrel obstruction ahead of the chamber.

[mike_556]

Originally Posted by mhanna91

So they attributed this to the case not being crimped to the projectile properly? I don't crimp my reloads at all. Should I re-think this?

I wouldn't worry--I have a hard time believing a bullet set back THAT far into a case whereas rifle powders generally take up almost all of the available space in the case. And not to be able to generate pressure THAT high. It's slightly possible there may have been an incorrect, say doubled pistol powder charge in there, but being factory it shouldn't have happened. Headspace that badly deteriorated maybe? Perhaps a severe case (head) failure?

FWIW I've loaded coming up on 15,000 rounds of carious .223/556 loadings for practice and match use--never have I crimped one of those rounds, on the advice of my NRA HP coach. Never had any trouble yet, either.

[mike_556]

It'd be nice to see the handguards removed to see if there was any barrel bulging from an obstruction--that'd do it every time if there was one.

[Artos]

Originally Posted by MAUSER202

I am not buying the bullet set back theory, the way that split looks more like a barrel obstruction ahead of the chamber.

kinda hard to prove that unless they pulled the case...confirmed setback and then put it back in to see what would happen.

could have been but doubtful they know 100% it was indeed setback pressure.

[5pins]

There is a recall on ths ammo. This is not the first KB I have read about involving this ammo.

http://www.remington.com/pages/news-...llowPoint.aspx

[Artos]

Originally Posted by 5pins

There is a recall on ths ammo. This is not the first KB I have read about involving this ammo.

http://www.remington.com/pages/news-...llowPoint.aspx

ouch...i didn't read the tos thread other than the o.p.

I hope someone posted it up over there...scary stuff. Makes you wonder what improper means. Too much powder, too little pwder, not enough neck tension, etc.

Lotsa folks stay away from reloading because they do not feel it is safe as factory....man, you just never know.

[mike_556]

After reading that recall I woud almost BET the farm on an incorrect (say, PISTOL) powder. Someone fu(ked up in Arkansas it looks like. Neck tension causing this? Doubtful. Pressure excessive? Wrong powder. I do doubt Remington will ever admit to it though.

[markm]

I hate the idiotic speculation that follows one of these incidents.

In before some tard says it was an out of battery firing.

[wetidlerjr]

Originally Posted by markm

I hate the idiotic speculation that follows one of these incidents.
In before some tard says it was an out of battery firing.

Well, that won't happen now. You have spoiled the fun for some 'tard.

[kwelz]

I swear it seems like there is a rash of these lately. It is making me paranoid to go shoot.

[ReaperAZ]

Man, glad no one was hurt in this incident.

[Heartland Hawk]

Wow. Thanks W.E.

I always try to stay away from this ammo because i have heard of a few inconsistencies. And this is one more.

[NWPilgrim]

My brother bought two boxes of Winchester super-X 64 gr SP last year and almost every round had a LOOSE bullet in the case. The slightest pressure on the bullet tip would shove it completely into the case.

So yes, manufacturers sometimes do use powders that do not come even close to filling the case. Plus there was no crimp (no cannelure), and obviously hardly any neck tension.

Fortunately when the bullet set back on the feed ramp it jammed in his LMT M4. We tried to chamber a few rounds until we realized nearly every round had this problem. Scary stuff.

[GTifosi]

See'd very simular happen once way long ago.
Upon hard inspection it was found that the bolt cam had not done its job AFA rotating the bolt to unlock.

The cam didn't shear so the carrier could just blow straight back, but it sure didn't move either due to gaulling on its sides (deep wear marks basically) which in turn kept all the gas pressure in the carrier with no place to release, so it blew the carrier apart.

It popped hard enough to rape the upper receiver simular to the pix, and also puked the bottom plate out of the magazine, rounds, follower, spring and all.

[Artos]

Originally Posted by markm

In before some tard says it was an out of battery firing.

I have never heard anyone say that before... would love to hear a detailed explanation of how that would work.

sigh...


~~~~~~~~~~~~~~~~~~~~~~

I gotta quick question...in general, is the AR design more robust to handle a KB compared to other combat semi's??






.

[Iraqgunz]

I am pretty sure that this one was discussed here elsewhere in the epic Kaboom thread we had.

[Dave_M]

Originally Posted by kwelz

I swear it seems like there is a rash of these lately. It is making me paranoid to go shoot.

No, we just have more AR's in circulation now than ever before.

[MistWolf]

Originally Posted by NWPilgrim

My brother bought two boxes of Winchester super-X 64 gr SP last year and almost every round had a LOOSE bullet in the case. The slightest pressure on the bullet tip would shove it completely into the case.

So yes, manufacturers sometimes do use powders that do not come even close to filling the case. Plus there was no crimp (no cannelure), and obviously hardly any neck tension.

Fortunately when the bullet set back on the feed ramp it jammed in his LMT M4. We tried to chamber a few rounds until we realized nearly every round had this problem. Scary stuff.

Bullet "set-back" will NOT cause a ka-boom. While seating the bullet deeper intrudes on case volume, it increases freebore. The bullet will simply move forward until it engages the rifling at which point the volume has returned to normal. If anything, this freebore will reduce pressures. I had a lot of reloaded 22-250 that had high pressures when fired in my rifle. After some investigation, it was determined the bullets were seated long and the ogive was too close to the rifling on chambering. After seating them deeper to the correct depth, pressure dropped to normal levels and the rounds were safe to fire.

What makes low neck tension dangerous, particularly with a self loading rifle, is that when the case stops in the chamber, momentum can carry the bullet forward until it jams itself against the lands. This can cause enough of a pressure spike to destroy the rifle.

If the ka-boom was due to low neck tension, it's not because the bullet was pushed back into the case, it's because the bullet slid forward in the case on chambering and was jammed against the rifling, causing dangerous pressure spikes