i' de pick any one of these big bores
8mm-06 , 338-06 , .35 whelen , 350 rem mag , 358 win , 358 sta , 450 marlin , 400 whelen

my personal choice would be any of the .35 calibers but , the 450 marlin and 400 whelen would be right up there to , but , you would probably have to have rcbs make up some dies for the 400 whelen as i don' t know of any standard producer for the 400 in respect to dies , shells , brass , etc...