look by yourself https://www.youtube.com/watch?v=Q1XNqXxYj04

he shoots a nilgai with a 50 BMG and the antelope instead of collapsing like an old house in an earthquake runs and runs before it stops and die slowly. the best is to see this guys face and how surprised he is about his success. I am sure nilgai were shoot with a 223 rem and die quicker before.