My vote is the animal. Very unpredictable. You could fill a railroad car with the deer shot with my 270win 7400. 90% have been hit broadsided less than 100 yards and out of that 60% with coreloks, 30% with gamekings, and 10% with nosler partitions and misc bullets. Some have hit the ground right where they stood. They were relaxed when shot and maybe off balance taking a step. Some took off running, even though I busted the heart. And made it 50 yards. I even seen one, I didn' t do this, but a freind make a bad shot and ripped the lower adomen open and the guts fell out and when we found it 80 yards away, gut job was almost complete. Pretty wild. Point is when people say they drop where they stand, I see they only shoot 1 or 2 deer a year. And probably with only a gun. You really can' t predict what these animals are going to do. They are fascinating at thier will to live. If someone thinks that there is a magic bullet out there that won' t make them run. Then they probably believe in the magic bullet theory with the Warren Commitee too.