Ive only had 3 deer not get a pass through, but this was way back when I used to use ,too light of an arrow, and didnt yet understand the importance of a properly tuned bow. Since then, Ive only used400gr or more ,total arrow weight, and muzzy or sonic heads and not only have I always got a pass through, they usually stick about 12" into the rocky dirt behind the deer. I think the sonics can pass though 3 deer!