A person that goes beyond the necessary level of action to meet a role. A better term for this is an over achiever. These people may set high goals for themselves, yet they are much higher than ordinary, and higher than needed. They will surpass even these unreasonably high expectations they have for themselves. also An over shooter may miss a target by using to much power. If you must be precise to meet a goal, not to high, not to low - but very accurate. an over shooter will be to high.

Somebody that uses more than is necessary to achieve something.