What caused this to happen?

[USGI]

I'm curious what you guys think might have happened to this shell case. I found this up in the hills the other day where a lot of locals go to shoot. I've found pieces of a revolver cylinder there before too, so that might give you an idea what can go on up there! From what I've found on the Internet, this isn't a caliber that used much in the military, so might not actually qualify as being a "Milsurp" round to most. After thinking about it a bit, I believe I know how it happened. Take a look at these pictures - I'd like to see your comments. - Bob

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