"Ammunition for light rifles was cheaper, too, which appealed to Bell the businessman and canny Scot. In 1913 he ordered two .416s from Rigby; it’s easy to imagine that he was curious about this new big-game cartridge that John Rigby had invented for the Mauser. He found that it was no more deadly than his .275s, but heavier, harder-kicking and noisier, and the ammunition cost more than twice as much."
"Bell reportedly shot 1,011 elephants with his Rigby .275 rifles, 200-plus elephants with .303s, 300-plus with his Mannlicher-Schoenauer .256 and many more with .318s, .350s, .416s and at least one .450/.400. Overall he probably killed at least 1,700 elephants “to his own rifle,” as it was said."
I dunno, seems there is a claim he killed most with the 7x57, and then about 700 with the others combined. So probably plenty with the .416, yet not nearly as many with the 7x57. Yet other articles only claim he killed 1011 elephants and they assume all the calibers involved.
I like others am a huge fan and like someone else mentioned only 10% of the stuff he did is true, he's quite the man in my book.
I have his book, just have not read it yet.