HELP- Stag 10 6.5 CM mishap

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highlander44

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Hey Guys.
I believe I had a close call today.... shot a round out of the Stag 10, and a second one went off RIGHT AWAY! when I looked at the case, it was apparent the cartridge wasn’t in battery, and went off prematurely! Bit of a background, have had approx 30 Ed’s through this rifle before this happened. Shooting 6.5mm 143gr ELD-X with Hornady brass, CCI200 primers, and 40.7gr H4350, which was right around 2500fps. Picture of the case below:

523AE104-905F-4466-842E-53EE64C32EC8_zpshbwbkpvp.jpeg
 
First, glad you're okay, that must have been a shock. Next, I'd disassemble the bolt and inspect the firing pin, channel and spring.
 
Gunk in the firing pin channel can stick the firing pin protruding out the bolt face. Does the Stag 10 use a free floating firing pin?
 
What BCG are you using?

The .308 bolts are usually a spring pre-loaded firing pin, and without the bolt head rotating (into battery) They should not be able to protrude at all.

These are hand loads? is it possible the primer was not seated correctly?
 
What length gas system? My experience is that semi 6.5's need lighter bullets in the 120 to 130 grn range...especially if it is a rifle length gas system rather than +2. I found 147 was hard enough on the brass that bits were being pulled off the case on extraction and jamming up the bolt and BCG. This was with a JP high pressure bcg.
 
Daver_II said:
What BCG are you using?

The .308 bolts are usually a spring pre-loaded firing pin, and without the bolt head rotating (into battery) They should not be able to protrude at all.

These are hand loads? is it possible the primer was not seated correctly?
Click to expand...

I’m using the BCG that came out of my Remington R-25.
 
b_w. said:
What length gas system? My experience is that semi 6.5's need lighter bullets in the 120 to 130 grn range...especially if it is a rifle length gas system rather than +2. I found 147 was hard enough on the brass that bits were being pulled off the case on extraction and jamming up the bolt and BCG. This was with a JP high pressure bcg.
Click to expand...

The gas tune is the exact same length as I had when it was a 7mm08. This started as a Remington R25, and I bought the stag 10 receiver and a IBI barrel in 6.5, and moved all the components over.
 
highlander44 said:
Hey Guys.
I believe I had a close call today.... shot a round out of the Stag 10, and a second one went off RIGHT AWAY! when I looked at the case, it was apparent the cartridge wasn’t in battery, and went off prematurely! Bit of a background, have had approx 30 Ed’s through this rifle before this happened. Shooting 6.5mm 143gr ELD-X with Hornady brass, CCI200 primers, and 40.7gr H4350, which was right around 2500fps. Picture of the case below:

523AE104-905F-4466-842E-53EE64C32EC8_zpshbwbkpvp.jpeg
Click to expand...

That would be an out of battery discharge. Your free floating firing pin is most likely not free floating meaning the pin was protruding when the bolt cycled discharging the new round before the bolt was locked in battery. AR bolt need to be run wet. Disassemble the bolt, clean thoroughly, check the firing pin for being bent, fix as required.
 
So i assume it is rifle length. Don't know much about 7mm but I know there is a difference between what 308 and 6.5 semis like. Rifle gas in 6.5 with heavy bullets, a full weight carrier and the heaviest buffer was still violent enough on extraction to bugger up mine. Wouldn't be surprised if some brass flakes were jamming up your firing pin. I know lots of 6.5s are sold like this but the higher end ones are +2.
 
b_w. said:
So i assume it is rifle length. Don't know much about 7mm but I know there is a difference between what 308 and 6.5 semis like. Rifle gas in 6.5 with heavy bullets, a full weight carrier and the heaviest buffer was still violent enough on extraction to bugger up mine. Wouldn't be surprised if some brass flakes were jamming up your firing pin. I know lots of 6.5s are sold like this but the higher end ones are +2.
Click to expand...
Ok thanks- I’ll do some more research into that.
 
Please check your Bolt,

If yours is like either of mine, the firing pin is not free floating.

The casing is obviously an OOB discharge, based on the casing.

Please post a pic of the primer? was it struck by a firing pin?
Additionally do you have a pic of your BCG disassembled?



For those that don't know, the AR10 firing pin is not like the AR15. It is held to the rear by a spring until the hammer hits it.
And for the firing pin to hit the primer, the bolt would have to be almost completely rotated into the locked position.
Even if it were to be jammed up, the likelihood of a complete OOB discharge caused by the firing pin is very unlikely.

p1cxAW1.jpg
 
Pin could have bent or maybe your primer was proud and the bolt face or edge set it off. If you are new to reloading i would suspect the primer scenario.
 
Firing pin appears to be ok- here is the base of the shell, hard to say what’s all going on there..... My firing pin does seem to free-float, it does not have a spring inside, and I downloaded the exploded diagram of the particular BCG I have, just to make sure the spring wasn’t lost somewhere.

Apparently I’m over my quota on photobucket, but will post some pictures as soon as they let me.
tsnrvtt2


https://i.postimg.cc/T25GsvKy/B2-A6-CDBD-92-CE-4-C27-ACF6-254-EC0565-D32.jpg
 
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