another factor is distance. i limit my shots to absolutely no more than 15yds. < 10 is much better esp on bigger deer. shot angles are a factor also. i dont mind burying into the off shoulder as long as ive cut some good stuff in between. (aim for the exit, not the entrance) but you have to realize that the trail will be harder. lighted nocks help also. you see the shot placement much better and the path the deer runs much better and if no pass-thru, you can see the arrow sticking outta the dead deer up ahead.