Stole this from somewhere else...
Charger
http://img31.imageshack.us/img31/8851/c1m3mall0001.jpg
http://img31.imageshack.us/img31/5028/c1m3mall0002.jpg
http://img46.imageshack.us/img46/6437/c1m3mall0011.jpg
Jockey
http://img27.imageshack.us/img27/2319/c1m3mall0003.jpg
http://img46.imageshack.us/img46/5084/c1m3mall0004.jpg
Spitter
http://img46.imageshack.us/img46/191/c1m3mall0005.jpg
http://img19.imageshack.us/img19/186/c1m3mall0006.jpg
http://img27.imageshack.us/img27/6558/c1m3mall0007.jpg
http://img19.imageshack.us/img19/1743/c1m3mall0008.jpg
http://img27.imageshack.us/img27/13/c1m3mall0009.jpg
http://img163.imageshack.us/img163/4...m3mall0010.jpg
Conlusion:
Aim in front of Jockey.
Spitter easy to kill with such big hit boxes.
Hit chargers big arm or ass, lol.