Ok but penetrating means just that IE punching a hole in the skin, rib and meat then hollow space then lung tissue hollow space etc etc.A .308 DIA. 168 Gr. Bullet with a MV 2700 ft/s a Ballistic Coefficent of .450 creating 2719 lbs/ft energy at the muzzle will do that at 1000yds. Note the numbers are from Hornady's 2007 Catalog and based on their 168 Gr. MG BTHP.