The PHs I have used or encountered in the field used the following:

.416 Remington Mag - Remington 700 (left hand) - Zimbabwe;
.458 Win Mag - Winchester M70 - Zimbabwe;
.470NE - Merkel Double - Zimbabwe;
.458 Win Mag - Win M70 - Zambia;
.460 Weatherby Mag - CZ550 - South Africa;
.458 Win Mag - Winchester M70 - NT, Aust;
.416 Rigby - CZ550, NT, Aust;
.435 PH Express, M70 ?, NT, Aust.