I just shot my bear on Friday with a Federal Premium Vital Shock, 165 grain, 300 WSM. It did the job, no questions asked. Exit wound was about 4 inches or more (exited the front left shoulder, arm pit area). It did not appear to shatter inside the animal from what I could tell. Broke a few ribs on the way in, ruptured the heart, animal dropped within 30 feet or so.