Now I'm just a hunter mostly, but was always told from when I started "Aim small, miss small". When I started bird hunting (bobs) my uncle and Dad said "now pick out a rooster, look for that white head". While they were conserving brood stock they were also teaching me to focus on 1 bird and even more particularly on the head. That lesson also slowed me down a touch as the tendency for young quick reflexes is to throw up and pull! It was a good lesson. Now if only grouse had striped heads!