I took the first one with my 450-400 Chapuis at about 30 yards. It went down so hard the head bounced on the ground and came back and bounced off of the animals back, it actually broke the neck.

My father decided that taking a Wildebeest with a double looked like fun so he went next. A few dry fires a quick right and left at a rock on a termite mound and he was in business. About 45 yards, right on the shoulder, I think it was dead before it hit the ground.