Ammunition failure in M305

-raqh-

-raqh-

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Hey guys,

a friend suggested I try some Tulammo ammunition seeing he had good result in his M305.

This was only the 4th time I brought the M305 to the range and at the very end of the day I fired 4 shots of Tulammo .308. (Shot a bunch of Norinco copper washed during the day).

The third shot did an unexpected humff sound and the bottom of the mag went flying but the case ejected properly. Chamber looked fine so I went ahead to shoot the last 2 rounds...Couldn't fire the 5th as the rest of the casing you can see in the pictures (4th shot) is stuck in the rifle chamber. (Don't think I would've tried after the fire ball 2 inches from my face the 4th shot did...)

Nobody got hurt but it certainly shortened the day.

Now, I'm wondering if this is a headspace problem or if the ammunition might be the cause. Coming back from the range I read a good share of bad stories with tulammo cases splitting. I read that laquered cases might be the problem too and to support all this, I never had problems with the Norc stuff or brass cased ammunition.

But again, this is only the 4th shooting session with this rifle.

From what I understand there really is nobody in the province of Quebec that works much on those rifles so I'm kinda stuck for checkup/advices.
 
Never seen one like that before. The only thing I can think to explain the head shearing out like that is the extractor groove was machined too deep and the head drawn too thin, leaving very little material between them.

Of course, I've never seen a failure of a steel case due to excessive headspace, so maybe that's the morphology. Such things have always been labelled in mind as "highly improbable".
 
Steel doesn't stretch as much as brass before splitting, so probably a headspace issue with the steel.
The mag blowing out was probably due to the same issue where your case split in the chamber throwing gas backwards.
What does the case that caused the mag to fall out look like?

I have removed many stuck cases if you need help.
 
PitBull1973 said:
Is it me or does it look like the right side is missing material.
Your a lucky dude.
Click to expand...

SOCOM%20Chamber.jpg


Supposed to be like that

Shawn
 
jonh172 said:
Steel doesn't stretch as much as brass before splitting, so probably a headspace issue with the steel.
The mag blowing out was probably due to the same issue where your case split in the chamber throwing gas backwards.
What does the case that caused the mag to fall out look like?

I have removed many stuck cases if you need help.
Click to expand...

Like it was pointed out I should've stopped after the first malfunction.

The first round that blew the bottom of the mag is the one thats cracked but still in one piece. Right where the crack is you can see the case expended with the shape of 2 halfmoons (bottom of the chamber/feeding ramps).

Second shot that really blew off (the separated case and head) also openned up the bottom of the mag and actually sent a pretty intense gaz/fire blow back. No clue what the case look like as it's still stuck there.

Both heads/rims had the primers ejected from it's place. Other cases that fired fine all had the primer expended pass the case.


And yes, all help is welcome to remove the case. I tried briefly to turn and pull with a screwdiver but I was affraid to scratch the chamber and stopped.
 
I would say that a defective case is the likely cause. Head separations from excess headspace don't normally happen that way; the case splits along the body, rather than right at the extractor groove.
 
A .308/7.62 broken shell extractor is a good investment. I lucked out with a FC .223 case failure the other day when it ejected the back half and the jammed round pulled the front half out. Second firing, not gonna try for a 3rd on these.
 
I had the EXACT same issue with my M-305. Got it back from the gunsmith today to remove the case and inspect overall functionality of the rifle and the verdict was crap ammo (Tula as well).
 
I don't think that a broken case extractor would fit into the broken case. I would epoxy a plug into the case, and then tap out the broken case using a rod from the muzzle.
Give the chamber a thorough cleaning.
Check the headspace.
 
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