My point has been made, but theres one more thing i feel i should say. Its not the "penetration" that i feel is the problem, its the low margin of error. A deer's brain is not very big, and if you miss that, thenyou better get the spine or main artery or that deer is going to suffer like the one i shot did. At least with a heart shot attempt, you can get 2 lungs a liver, a spine, an artery, ora neck.