Kaboom 💥 Today 😟

[DoneNOut]

Things shooting good with 1x fired 708AI brass. (Lapua) 12th round shot and gun explodes out the mag well, ruptures mag and extractor. Ruptured case easily fell out the chamber. The separation line looks too clean. Bad brass? 11 fired cases look fine. No serious pressure signs.

 

[bamban]

Dang, scary stuff rat der.. bad brass gets my vote.

 

[simo hayha]

I told you two weeks ago,,,, you gotta keep your ex-wife out of the reloading room....

 

[74honker]

WOW glad you're ok.

 

[trout004]

Wow. I haven't personally seen that happen, but it sure looks like a clean break. Maybe the brass was defective, but I'm definitely not a metallurgical engineer. Glad that you are okay after that!

 

[K.E.C.]

WOW. DAMM. Maybe you should join Lenny and Play some Golf or Pickle Ball.
Look up and Thank Him.
Be careful and play safely.

 

[GLTaylor]

Like many here, I've been loading over 50 years, with many wildcats. Never seen that?

Glad you're OK!

I'd guess a bad piece of brass. Too regular in appearance for a common pressure failure?

 

[SSG Graybush]

Things shooting good with 1x fired 708AI brass. (Lapua) 12th round shot and gun explodes out the mag well, ruptures mag and extractor. Ruptured case easily fell out the chamber. The separation line looks too clean. Bad brass? 11 fired cases look fine. No serious pressure signs.
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headspace issue maybe? I'd check other fired rounds. Look to see if there's a line on them there as well. Are you sizing correctly? measuring with a headspace gauge and bumping the shoulder correctly? How many rounds though rifle? measure fired cases headspace and check spec.

 

[Ol' Red]

I would put a bore scope down the rest of that brass and check it out before using it. Do you still have ten fingers and thumbs?

 

[ATH]

Could be headspace issue or reloading issue with too much shoulder setback, leading to thinning and case head separation.

 

[bergara0256]

Glad you're ok!

 

[SSG Graybush]

Things shooting good with 1x fired 708AI brass. (Lapua) 12th round shot and gun explodes out the mag well, ruptures mag and extractor. Ruptured case easily fell out the chamber. The separation line looks too clean. Bad brass? 11 fired cases look fine. No serious pressure signs.
View attachment 485825
View attachment 485828
View attachment 485829

 

[lancetkenyon]

I would say bad brass too. You can see the separation line goes all the way around.

What brand? And how many pieces?

I think I would ditch them all if it were me. Start over with new brass.

 

[DoneNOut]

headspace issue maybe? I'd check other fired rounds. Look to see if there's a line on them there as well. Are you sizing correctly? measuring with a headspace gauge and bumping the shoulder correctly? How many rounds though rifle? measure fired cases headspace and check spec.

I'm only .0015 shoulder bump. Other fired cases look fine. I'm probably at 200rnds through the barrel.