http://www.fivesevenforum.com/viewtopic.php?f=18&t=57
These ballistics tests showed 4” wound channel in a pork shoulder. Ballistic gel was showing 9 to 11 inches of penetration. Its hardly a .22 magnum. Obviously it is not in the same league with a .223, but it does leave a really nasty wound channel. It would be interesting to know the extent of the police officers wounds.
I know, but real world reports show that (perhaps not surprisingly) the pork isn’t that accurate in this case. You get penetration but not much of a permanent wound channel.
For example, just reported on TXCN: One soldier took a 5.7 round in the sole of his boot at relatively close range and it didn’t even go all the way through, nor did it blow the sole off.
Bullet weight and muzzle velocity are not that much different from .22 WMR. 5.7 is a little faster out of a little shorter barrel, bullet weight is or can be, the same.