A similar discussion here,
Australia's AFP are operating Rotary Wing Airframes? with this comment:
Originally Posted by Mitch Vernon
We recently conducted helicopter marksman training in Australia for an asian police force.
The shooters were machines. They could reliably hit a watermelon out to 200 meters, from the back of a shaky old jetranger.
I for one wouldn't want to be a bad guy on the recieving end.