Jon Sundra used to publicize his hunts using the No.1 way back when. He used different calibers when hunting in Africa and he now says that after quite a bit of hunting, he won't use a No.1 anymore. After all he's gone there so many times that I think he's figured what works and what doesn't. He is also famous or infamous for being the first to neck up the 300 Ultra to 375 Ultra. He was Mr. 375 for quite a while.