I am a great defender of mechanical heads. Most problems that people have with them are related to tuning issues or shooting one with too wide of a cutting diameter for the amount of KE their bow produces. That said, it has been my experience that Spitfires with their stiff blade retention clips and wide cutting diameter require a lot energy to achieve consistent pass throughs. My advice for a mech head would be get yourself some Rocket Steelheads in either 100 or 125 grain. The only trouble you will have with them is digging them out of the ground and tree stumps on the other side of deer.