HELP- Stag 10 6.5 CM mishap

As Daver-ll said it's pretty much impossible for the firing pin to protrude unless it's broken. Try it yourself, as soon as the carrier starts to move the firing pin will be withdrawn into the bolt, and as he stated it can't move past the bolt face until it's pretty much locked. High Primer is the likely reason, or perhaps some debris if everything else looks good. Are you particular about how clean your ammo is? It just occurred to me that an Out of Battery Discharge could be caused by a small stone. Maybe I'm not being fussy about keeping my boolits clean and dry after all.
 
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Here are the firing pin and primer

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There are some things in this thread that are not correct, starting with spring loaded firing pins in "AR10" type bolts. If you do a bit of research, a large majority of "AR10" type bolts do not have a spring loaded firing pin, including LMT and Knights Armament (two of the top tier manufacturers), rather the large majority utilize a free floating firing pin. Obviously, there are a few on the market that do have a firing pin spring.

- It's possible as others have said, that the firing pin and/or firing pin channel had dirt or debris causing the firing pin to be stuck in the forward position.

- like some of the other guys also said, check the primers for seating depth. If they're proud, you could experience an out of battery detonation. (This seems less likely given you posted a picture of the primer which indicates the firing pin did strike the primer to some degree)

- You should have the trigger, hammer, and disconnect checked out. If the hammer isn't properly resetting, it could be following the carrier as it completes the feeding, locking and chambering cycle of action. This is commonly referred to as 'doubling', insofar that you fire the first round, and unexpectedly the next round goes off without input from the shooter.

- It appears you're using the bolt, and bolt carrier assembly from your Remington rifle?

- Have you tried factory ammunition at all, or only your hand loads?
 
Is the firing pin mark on the primer from being struck by the firing pin, or was it formed when pressure forced the primer against the firing pin hole in the boltface?
 
highlander44 said:
There is so much damage to the case, it’s hard to say.... all the primers were set to depth, but some were not “super-tight” when I put them in with a hand priming tool.
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Damage to the case wont change which direction that firing park is going - thats why a number of people have asked if its indented, like it should be when struck by a firing pin, or if its protruding, meaning the primer flowed into the firing pin hole of the bolt.
 
The remarkable - and fortunate - thing is that the cartridge case did not fail at the head, allowing high pressure gas to be released into the action.
 
I've looked at that pic a few times, the primer looks slightly raised, I doubt the firing pin came in contact with the primer. Also since the firing pin isn't broken I don't see how it could strike the Primer in the first place. Just how "loose" were the Primers, and how long have you been reloading? I ask because I recently had about 7 Winchester Primers that left me wondering how in the hell I had loose pockets after two firings. I marked the brass and used a few CCI 200's I had left over, nothing wrong with the pockets. I'm assuming you've inspected the Bolt, and found nothing unusual, no damage/bits missing from the Bolt and the Barrel Extension. If so high Primer, or some debris, the Primer is easy, just get into the habit of running your finger over the base of the case each case you prime (and why I'm not too keen on the idea of Priming on a Progressive Press).

Regarding the sloppy Primers, has anyone else noticed any sizing weirdness with Winchester LR Primers lately? I just put it in the Priming tool again and gave it an extra squeeze, marked the case, and set aside the 7 to use for warm up shots, it's easier to keep track of a possible bad case that way. There was definitely something wacky with those 7 Primers.

You can't really have a "Slam Fire" with this style of Bolt Carrier and Bolt like an M-14 if I'm not mistaken. I've induced a Slam Fire once with my M-305, last time I tried single loading one.
 
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Always a good idea/precaution to use CCI #34s in autoloaders.

I wonder why military ammo primers are crimped.

Any soldiers in the group been sent out to practice with reloaded ammo?
 
redshooter said:
I've looked at that pic a few times, the primer looks slightly raised, I doubt the firing pin came in contact with the primer. Also since the firing pin isn't broken I don't see how it could strike the Primer in the first place. Just how "loose" were the Primers, and how long have you been reloading? I ask because I recently had about 7 Winchester Primers that left me wondering how in the hell I had loose pockets after two firings. I marked the brass and used a few CCI 200's I had left over, nothing wrong with the pockets. I'm assuming you've inspected the Bolt, and found nothing unusual, no damage/bits missing from the Bolt and the Barrel Extension. If so high Primer, or some debris, the Primer is easy, just get into the habit of running your finger over the base of the case each case you prime (and why I'm not too keen on the idea of Priming on a Progressive Press).

Regarding the sloppy Primers, has anyone else noticed any sizing weirdness with Winchester LR Primers lately? I just put it in the Priming tool again and gave it an extra squeeze, marked the case, and set aside the 7 to use for warm up shots, it's easier to keep track of a possible bad case that way. There was definitely something wacky with those 7 Primers.

You can't really have a "Slam Fire" with this style of Bolt Carrier and Bolt like an M-14 if I'm not mistaken. I've induced a Slam Fire once with my M-305, last time I tried single loading one.
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I’ve been reloading for over 10 years, and about 4-5yrs for an AR10. Never had this issue.... the primer is sticking out a bit in the picture, but that is due to the slam fire/OOB detonation. It was not like that when it went in the mag. After this close call, I’ve been doing a bunch of reading, and it is very possible to have a slam fire with soft primers in any AR. Google “Sierra Bullets reloading for AR’s) and they go to in detail the differences. Has been an eye opener.
 
highlander44 said:
I’ve been reloading for over 10 years, and about 4-5yrs for an AR10. Never had this issue.... the primer is sticking out a bit in the picture, but that is due to the slam fire/OOB detonation. It was not like that when it went in the mag. After this close call, I’ve been doing a bunch of reading, and it is very possible to have a slam fire with soft primers in any AR. Google “Sierra Bullets reloading for AR’s) and they go to in detail the differences. Has been an eye opener.
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Now I'm even more convinced that it wasn't a Slam Fire, you fed it from a Mag, that reduces the potential dramatically. As for Sierra's warning re. AR 10/15 Slam Fires, can you provide a link? My Manual refers quite clearly to Service Rifles, in the Gas Gun section of my manual, not AR's in particular, pull your BCG and move the bolt back and forth while pushing on the firing pin, it can't protrude until the round is pretty much fully chambered, and the locking lugs should already be partially engaging the barrel extension.

I'm not saying it can't be a Slam Fire, but unless I'm misunderstanding how the BCG functions, I can't see how it is.
 
redshooter said:
Now I'm even more convinced that it wasn't a Slam Fire, you fed it from a Mag, that reduces the potential dramatically. As for Sierra's warning re. AR 10/15 Slam Fires, can you provide a link? My Manual refers quite clearly to Service Rifles, in the Gas Gun section of my manual, not AR's in particular, pull your BCG and move the bolt back and forth while pushing on the firing pin, it can't protrude until the round is pretty much fully chambered, and the locking lugs should already be partially engaging the barrel extension.

I'm not saying it can't be a Slam Fire, but unless I'm misunderstanding how the BCG functions, I can't see how it is.
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Here is the article, mentions both service rifles and AR’s throughout,

http://www.exteriorballistics.com/reloadbasics/gasgunreload.cfm
 
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