A friend of mine just killed a 5by5 elk with a 143 x bullet from a 6.5prc. 175 yards . Touched rear of shoulder blade and proceeded to come apart. Blew a2inch hole in the rib cage and made it just far enough to bruise the first lung. Blood shot meat all the way up to backstraps. The bull went a little ways and laid down and died. Bullet failure? Dead elk! No holes into heart or lungs. Ed k