a failure with a 300 BLK

wayupnorth

wayupnorth

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So my dad called me.
he went to the range yesterday and was shooting his 300 Blackout and it jammed on the 2nd shot.
jammed up so good that he couldn't get it out and had to bring it home to clear it.

what he says happened.
2 round of the mag, shot just fine, then he noticed it was jammed.
popped the mag out and tried to work the charging handle and the BCG wouldn't move more than 1/2 and inch back.

he got home and took the 2 pins out to take the rifle down, he said both where really hard to get out but they finally came out.
he ran a dowel down the barrel and gave the brass a couple taps.
he said initially nothing, then when it let go everything let go, the brass and the BCG all came out.

he looked at everything and everything looks fine.

he asked me what i thought the issue might have been?

he was thinking the ammo.
its a brand new ammo and was only the 2nd mag of it he had ran.
the 1st mag he had a stovepipe that bend the brass in half, then the 2nd mag the jam.

he ran aprox 100 rounds 2 weeks before of different ammo and not one hand up.

i know its hard to diagnose the issue sight unseen, which is what im trying to do, but i thought id ask if anyone else has ever had this issue?

thoughts?
 
I take it these are factory ammo? Home built upper or factory? I had issues with an NEA 300BLK barrel on one of my builds. The leade was pretty shallow and I had to sit bullets way too deep for my liking. Ended up with a DD barrel and it eats everything.
 
factory, Sellier & Bellot i believe he said.

gun is all factory, NEA, came as a unit straight from Canada Ammo about a year or so ago.
like i said he has run a couple hundred rounds through it of Hornady and no issues even shooting 100 rounds last weekend with no issues, now 2 mags of the new ammo and this happened.

it sounds like a ammo issue but i thought id ask in case im missing something obvious.

my dad said he is gonna caliper the brass to see if its bulging or out of spec.
 
Any signs of overpressure on the brass that was stuck in the chamber ? Any marks on the brass, indicating a dirty chamber ?

The only time I had similar things happening was with a bolt action and hot reloads.
 
Thread title should be changed to "a failure with an NEA"; that way it is self-explanatory... ������
 
I've owned four 300BLK rifles over the years and never experienced any issues other than one of them wouldn't cycle factory Hornady 208gr subsonic. I've shoot handloads exclusively through my rifles since then though without issues.

I would have the chamber measured, weird that it works fine with other ammo but not the S&B. It sounds like an ammo issue but you can never rule out the rifle when it's NEA/BCL. Might just have a slightly tight chamber and the S&B might be slightly out of spec adding together to cause the problems.
Hopefully there's a good smith close by who can clean up the chamber and get it to eat anything. I have a guy in Calgary who can do it if there's no one local to him (not sure if my guy in Edmonton has tools for 300BLK), PM me if you need a hand.
 
I would check the head space, I have seen a BCG locked in an empty chamber so tight you had to take the upper receiver off and stick a dowel down the barrel. Turns out the barrel nut has gotten loose after about 100 rounds.
 
I've never measured the S&B ammo. But I've had Hornady ammo that didn't conform to SAAMI spec causing jams like you described. I would get the calipers out and measure a good cross section of that ammo against the SAAMI specs. Next would be to check the chamber.
 
cr5 said:
I've owned four 300BLK rifles over the years and never experienced any issues other than one of them wouldn't cycle factory Hornady 208gr subsonic. I've shoot handloads exclusively through my rifles since then though without issues.

I would have the chamber measured, weird that it works fine with other ammo but not the S&B. It sounds like an ammo issue but you can never rule out the rifle when it's NEA/BCL. Might just have a slightly tight chamber and the S&B might be slightly out of spec adding together to cause the problems.
Hopefully there's a good smith close by who can clean up the chamber and get it to eat anything. I have a guy in Calgary who can do it if there's no one local to him (not sure if my guy in Edmonton has tools for 300BLK), PM me if you need a hand.
Click to expand...

he's in Calgary.
ill talk to him later this week to see if he calipered that spent brass.
 
wayupnorth said:
he's in Calgary.
ill talk to him later this week to see if he calipered that spent brass.
Click to expand...

Let me know if you need me to help get him in touch with my buddy in Calgary, he has been building AR's and 300BLK AR barrels for years and built two excellent barrels for me. If he can't fix it I doubt anyone can. He also used to work remotely for NEA so he knows them inside out and has no bias against them as far as I know.
 
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