Jakhammers ROCK! You hit them where you are supposed to and they will leave a very short and wide blood trail. Check out the below links to see actual blood trails from a couple does I killed this past season.
http://www.huntingnet.com/fieldjournal/fieldjournal_detail.aspx?nID=225
http://www.huntingnet.com/fieldjournal/fieldjournal_detail.aspx?nID=263