Slow learner
The case was fired in a Glock pistol as new ammo. The case was reloaded and fired in a Glock pistol again. It happens frequently but usually the case orientation is not identical. This time the ruptured case had the "Glock Bulge" on the bottom the second time it was fired.
All of my 40 S&W brass is fired in Glocks. I picked up the brass at a police range after the shooting was completed. About 90% of my 9 MM brass was fired in Glocks. I load all my 9 MM and 40 S&W ammo at or just below mid-range powder charge. I have found multiple ruptured cases in my fired brass.
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S&WHF 366
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