@Sally PB - .22's I am pretty sure are illegal to shoot deer with in Pennsylvania, and really you shouldn't use it.
It's not strong enough to kill a deer instantly or within a few short minutes with not having suffering. The deer can go up to 3 days shot with 22 and not die, sometimes you find these .22 rifle shot victims by rivers, streams, creeks, etc...
All in all, if you are hunting deer, you should use a higher powered rifle, a deer hunting rifle to hunt deer. .22's are meant for squirrels, turkeys, and other small game.