sorry Dave..I am of the momentum groupies. Yes speed is the first thing we measure..why? Cuz all things rely on it to some extent and its the simplist to measure! But having an equation that relies 2/3rds on one thing and hardly at all for the other. Also looking at down range...it isnt KE that keeps it going through a moose rib, its momentum! Kinda the big truck little car crash theory! That has been proven time and time again up here with the fellas trying to shoot super light's and smack bones where as my super slow heavy weights busted one on the way in and nicked one on its way out!