Bow kills are based upon maximum hemoraging (spell) through the severing of vital organs and associated plumbing. There will be a lag time between the hit and death, which varies with the shot hit position. Some broad head shots will drop a deer in it's tracks such as a front spine hit other shots simply need additional time to render death. My best honest view says, good solid broad head hits usually results in death quickly, 10-20 sec, with an average travel distance of 20-40 yds. I've always believe a double lung broadside hit is the best archery shot, followed by a heart shot, others may disagree with this but this is my best take on the subject. Probably should put this in the archery post/forum but it came up here.