In reply to: I don't know of any other hunters who took elephants down with .22 cal bullets, even his favourite, the .275H&H is still a tiny cal compared to what most hunters use these days...
The .275 H&H and .275 Rigby are two different animals. The 275 Rigby is pretty much a renamed 7x57, the 275 H&H is a shortened and necked down 375 H&H Mag, very similar ballistically to the 7mm Rem Mag.