What does kinetic energy have to do with terminal performance? In an Inelastic collision (which a bullet strike is) most of the KE is transformed into other forms of energy, mostly thermal.
Damn it Jim, I'm not a scientist. I think this is specifically around the 85 TSX vs. the 110 TSX which has the same nose cavity. The 110 has more cushion for the pushin so it opens at lower velocities.
