zim
I believe those were fired thru a gelatin block with a wrapping or two of denim on em to simulate cloting over a body. Iffen ya hits a bone they are not as symetrical and in only one piece like that.
There used to be a really good website I had a link to that had all kinds of pics and fbi shooting data on it. Sadly it is gone.

Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!