Had a couple of zingers the other day whilst zeroing in my .17HMR I was using Federal V-Shok, like dazzb says, I thought they were supposed to fragment on impact.
It's my understandind that some FAO's would prefer you to have a 17HMR, rather than a .22LR, for this very reason as they are supposed to fragment on impact and not ricochet.
ATB.