Bear Creek Arsenal .300BLK Kaboom
- Thread starter DAVE_M
- Start date
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You're right.
The bolt has to be turned and in the Carrier for the firing pin to reach the primer.
Either there was a high primer, or that cartridge was in battery at the time the firing pin struck the primer.
I'm still thinking that with multiple projectile remains in the barrel, there was an operator problem.
The "squibs" are not typical squibs. The lead core was ejected from the barrel, but the jacket was stuck. If you look at the first jacket, it's split as if the core ripped straight through it. The second jacket is similar. The third must have piled up and kaboom. This could have been caused by short headspace in addition to the squibs.
If it went bang, the case ejected, and a projectile came out of the barrel, would you think to check for the bullet's jacket in the barrel? You and I both know what a squib sounds like and I bet this one didn't sound like that.
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Stills from a video update:
This is one of the rounds that were being fired. Two rounds were still lodged in the magazine when it went kaboom. He was shooting super sonic .300 BLK factory ammunition that had jacketed projectiles. The rear of the bullet was open, as is with most jacketed (not plated) rounds. Somehow, the first two bullets lost their jacket in the barrel, the lead core shot out, and the gun cycled. On the third round, everything stacked up and went kaboom. If they were true squibs and were before the gas port (as they are) the gun wouldn't have cycled. So I'm not entirely chalking this one up as user error.
The gun went bang and cycled.
This is one of the rounds that were being fired. Two rounds were still lodged in the magazine when it went kaboom. He was shooting super sonic .300 BLK factory ammunition that had jacketed projectiles. The rear of the bullet was open, as is with most jacketed (not plated) rounds. Somehow, the first two bullets lost their jacket in the barrel, the lead core shot out, and the gun cycled. On the third round, everything stacked up and went kaboom. If they were true squibs and were before the gas port (as they are) the gun wouldn't have cycled. So I'm not entirely chalking this one up as user error.
The gun went bang and cycled.
In the first picture, it looks like all of the copper jackets are before the gas port so it doesn't seem like it would have cycled correctly unless enough gas was let through when the lead core ejected.
Sounds like an ammo issue to me I really want to know the brand of ammo the guy was using as jacket/core separation should not be happening in the barrel.
Sounds like an ammo issue to me I really want to know the brand of ammo the guy was using as jacket/core separation should not be happening in the barrel.
I wonder if the bore is slightly undersized? The jacket is basically jamming in the bore due to the pointed bullet shape guiding it in, and since the jacket does not cover the back of the bullet, the lead core is taking all of the pressure from the cartridge and forcing the lead core through the front of the jacket and down the barrel, past the gas port, allowing the rifle to cycle the next round.
The jacket of the 1st bullet went far enough down the barrel to give the 2nd bullet some space before it got stuck and ejected its core, which let the gun cycle the 3rd round. Then the 3rd round did the same as the other two, but there was not enough space for it to do anything but rupture the case.
Were there any pics of the bolt?
And could we be looking at out of spec ammo, slightly over sized jacketed bullets?
The jacket of the 1st bullet went far enough down the barrel to give the 2nd bullet some space before it got stuck and ejected its core, which let the gun cycle the 3rd round. Then the 3rd round did the same as the other two, but there was not enough space for it to do anything but rupture the case.
Were there any pics of the bolt?
And could we be looking at out of spec ammo, slightly over sized jacketed bullets?
So round 151 was either a little out of spec or the first round on the extreme large end of in-spec and the first one to get caught on the groove? Did he get any pictures of the groove? I can't see anything in the pictures although I do realize they are web quality and not high resolution. Also, in the attached picture, borrowed from your first post, was a finer cut made on the right and a thicker cut made on the right? I'm trying to figure out the lines where the first stuck round starts.
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