This is a head where you hear nothing but good things when deer are at broadside and your going through ribs (As any broad head would do). But lets face it thats not always the case in deer hunting. Most of the time your dealing with angles and with a moving animal, your not "always" going to not hit bone. It's just a fact. Look at the broad head test with these they get a low rating for durablity but great for flight. It's also afact that you loose alot of energywhen these blades have to flip allthe way back to their cutting cupacity. I've see slow motion footage of heads like this entering ablock of that clearhardjelly.The bades don't actually fold all theway back to there cutting cupacity until they are in the deer leaving a small entry wound. I shota doe withthe Jackhammerand it went throughher on an angle and hit heroposite shoulder, the head almost completely shattered. I'veheard several cases where theseblades have been sheared right off. If youhear good things aboutthis headit's coming from people that havn't hada problem yet.

Look at the stingers and look at all the people talking about how nice they fly and there style is the best penetrating head out there right now. They fly like field tips (really do) and are sharp ashell. Why would youuse amachanical when you don't need it.