Kaboom 💥 Today 😟

[Mike Matteson]

I charge each case individually with a 1500 Chargemaster. There's no hidden double charge. If I load the same case twice, there's 46gr of powder spilling everywhere.

That's what happens to me. Can't miss the powder going every wear.

 

[Pdvdh]

Lots of factory cases have shoulders blown forward 0.005" or more on first firing.

 

[DoneNOut]

Lots of factory cases have shoulders blown forward 0.005" or more on first firing.

Everyone I know.

 

[Culpeper]

This probably would have happened with factory 708 ammo. If the chamber is loose the ejector or firing pin moved the case forward. I think you mentioned that they were loose chambering if I recollect correctly.

 

[DoneNOut]

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?

Looks good in scope.
So the case ruptured not where everyone thinks.

It ruptured here on the seam at extractor groove:

 

[Culpeper]

View attachment 486019
Looks good in scope.
So the case ruptured not where everyone thinks.
View attachment 486026
It ruptured here on the seam at extractor groove:View attachment 486031

Yep, it moved forward and split perfectly around the web there.

 

[DoneNOut]

This probably would have happened with factory 708 ammo. If the chamber is loose the ejector or firing pin moved the case forward. I think you mentioned that they were loose chambering if I recollect correctly.

Maybe a couple thou short on 708. I only had .0015 short of fired length with 708AI cases. Some AI cases chambered with the slightest feel of contact.

 

[kgunz11]

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

Look fine to whom? Do you know what you are looking for?

 

[Roughrice]

Well… With your reloading experience and apparent care and attention to detail as well as most of us on here that are analyzing the ruptured case without a clear cause and something that most or all have never seen, makes me think you may never figure out what went wrong with that load.

One can only hope that will not happen again.

 

[SSG Graybush]

I have found a 308 bullet in a box of 7mm Hornady Interlocks. A bullet I didn't have any of. A another time in 308 flat base Interlocks I found a bt, I can't remember if it was the same weight. I stopped buying Hornady stuff after that. Their CS treated me like I was lying.

 

[DoneNOut]

Got some brass measurements with my Mitutoyo micrometer.

Readings at case juncture with pressure band:

Sized: .47150 ave
Fired: .47405 ave

Across all cases fired yesterday. .00255 growth when fired.

 

[Culpeper]

Maybe a couple thou short on 708. I only had .0015 short of fired length with 708AI cases. Some AI cases chambered with the slightest feel of contact.

It split perfectly right around the web. Only a few things can cause that to happen. The image is just for informational purposes.

 

[DoneNOut]

Look fine to whom? Do you know what you are looking for?

From measuring stuff

 

[243winxb]

Well its no Remington type 3 rings of steel action. No wonder tnere is no case head left.