My 10 year old Grandson Ben just killed his first deer, an 8pt buck with a .243 using Rem. 100 grain corelocked ammo. The deer was faceing away at an angle, the bullet broke the last rib on the "in" side and a rib on the "offside" before lodging in the hide. I recovered the mushroomed slug and weighed it...67.1 grains. Thats 67.1% PS the buck piled up after 30 yards. That is performance!