Currently I have 68 ft. lbs. of KE which should be enough to kill anything on this continent with any broadhead I choose. In my early years of bowhunting I didn't know what KE was and used very inefficient mechnaicals with a slow bow (217 fps) and still achieved pass throughs. You should be able to get enough KE for mechanicals with any of today's bows even with a short draw length. IMHO some hunters use KE as a crutch for generating excuses when they lose game to poor shots.