My sample size is one, it took 9 rds of 416REM 400gr AFrames. First 3 shots were text book, then it was putting bullets where you could. I'm not going to lie when he did not go down after the first 3...I was wondering what I had gotten into. Then it was reload, find your mark and send another round. I was happy I spent as much time dry firing as I did, It paid off. I know talking with people some, a buff can go down with one shot from a 375H&H. Then you hear stories of 12 rounds to bring it down. Until it happens to you, it doesn't seem logical. Needless to say, I now have a 458Lott. Some animals do not have the will to die, they are the ones that leave an impression.