What caused this? (Case rupture)

[Sabot]

.380 ammo in a 9mm? It kinda looks like that, seen it before.

[J-cat]

Not really. That little bitty case isn't real forgiving. I've seen .010" change in OAL make a pretty big difference in how it shoots.

My own pet target load is pretty mild in commercial brass and flattens primers in NATO brass.

Now... firing a pistol that is doing that multiple times without noticing...

I disagree.

People load 9mm to major power factor using medium burning rate powders and push 50,000 PSI all the time. S&W made a .356 TSW which was a 9x21 loaded to 50,000 PSI. It takes alot more to blow a hole through a casehead.

I'm thinking a double charge did this.

[Kappy]

A really bad case of "glock bulge"
Hot load + unsupported chamber.

I'm going to second this with an addition of "out of battery."


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