TINY TUESDAY

It's Tiny Tuesday and I'm adding a bit of a mystery. Some of you might guess what it is right off...others may have to be told.  Think about it...make your best guess.
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Look in Large for details.

THE ANSWER: kayakgirl got it right.   This is the jacket of an FMJ 9mm Hollow point bullet. This was shot at a steel plate, the hollow point of the bullet flattens out, the jacket peels back into this mushroom shape. The lead of the bullet is flattened out when it hits the steel plate and all that remains is the full metal jacket. This mushrooming effect is what makes hollow point bullets more dangerous. They are forbidden for use in war by the Geneva Convention for that very reason.
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Legal for war bullets are FMJ without hollow points. They tend to make a hole and go right through the target. Hollow points will mushroom and cause greater internal damage.