looks like someone was trying to push 9mm.
+1 to that.....We should save this thread for the next time somebody asks if they should buy and shoot reloads they found for a good price at a gun show
Glock brass.
That was my first thought when I saw the pics - this is probably not an overpressure sign since the primers are still well formed at their circumference and are not flattened in any way. I suspect a firing pin protrusion issue.however it is my understanding that with overpressure the primers would flatten against the breachface and fill in the valley between primer pocket and primer. these show no sign of that.