Oklahoma Rebel,
To me, the "pros" outweigh the "cons" for the 9.3x62, .375 Whelen & .400B-WI, as all can be made easily from .30-06 cases, are plenty powerful for most any big game & all are "cast bullet friendly".
(I feel the same about 9.3x57, as those cases are easily made from 8mm Mauser, fine with GCCB & the old 9.3x57 is a GOOD round for taking moose, elk & the medium-sized bears.)
yours, tex