At the distance you stated the 22 will work just fine, however keep in mind that your shots will most likely be at a moving target, and the head is not that large.
Like you I would still plan on head shots and do my practicing on moving targets.
If you have someone and a safe barrier they can be behind have them roll blue rock (clay piegons) across in front of you.
If that's not feasible you can build a start ramp that you activate to release the blue rock.
I would use hollow points, that should minimize ricochets in case of a miss.
There was a case in Missouri where a small girl was killed by a 22 ricochet, to my understanding she was a half mile from where the shot was fired.
Good luck stay safe.