I've seen .22 LR ricochet It's because they're not fragile enough at the kind of speeds they travel at, to break-up on impact. Result is that they remain a relatively intact chunk of metal and whizzes off at an angle creating the ricochet noise. the .22lr is famous for ricochet...
I can't say whether it's true or not, but I'll give my +1 to friz; I've seen everything from 22s to whatever large shot deagles fire rebound and hit people. There's one youtube vid of someone getting hit with a rebounded deagle shot... Not fun. So it's entirely possible, and friz, make sure there is a soft dirt mound behind your target to absorb such misses.