Excellent post GMMAT. Way too many people screw on a mech head to get their field tips and broadheads to group together. But that doesn't solve the underlying problem of their bow being untuned. Many of these same people also have no clue how much kinetic energy their bow is generating and therefore often choose a mech head that has way too big of a cutting diameter for their particular set up. Then when they lose a deer due to the under powered fish tailing arrow flight their bow is producing, they head for the internet to loudly proclaim that it was the broadheads fault and that all mech heads suck. But even with those two problems on board most of those people would still kill deer if they actually made good shots on them. Deer are not that thick from side to side. Shoot a deer tight behind the shoulder and 7 inches of penetration will kill him dead as Julius Caesar. Without an exit hole the blood trail will likely suck but the deer should be on the ground within 100 yards. Most claims of perfect hits on lost deer are just that...... CLAIMS!