My son who is 10 just shot a mule deer buck 2 weeks ago. The buck was bedded directly away from us at 275 yds. My boy was laying prone. I had him hold about 8" behind the bucks shoulders.He was shooting my 243 with 105 berger hybrids. The shot broke the bucks back,continued into the chest, and destroyed the lungs. I found the bottom piece of the bullets jacket under the hide of the brisket. The bullet began rapid expansion upon hitting the spine,but continued downward through the chest. The buck absorbed all of the bullets energy. At the shot, the buck simply rolled over. The buck grossed 172, was 5 1/2 and really big bodied. Not sure of the weight. We have shot 3 big bucks with this bullet, all with excellent results.