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Looks like Edward ScissorsHands type of round. I saw the ballistic gel tests a few days ago, and those pieces act like fleschettes from a special shotgun shell. What’s left of the copper round’s base is small compared to a .45cal 230gr HP, but the wound cavity damage is genuinely nasty. Other tsts:
http://www.youtube.com/watch?v=skFhKtCo5aE
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http://www.youtube.com/watch?v=dAdQa7c4d9Q
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http://www.youtube.com/watch?v=eWINwccJ37U
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http://www.youtube.com/watch?v=skFhKtCo5aE