For hunting elk and moose in grizzly country, a ctg. is a great choice, as-are the 9.3's and .375's.
Needed? no, but those who use them, like them a LOT.
Most around here used the 200gr. Speers on up to the now-discontinued 275gr. Speer. I of 2 chaps who hoarded those heavier Speer bullets, used them only for moose hunting, but both guys also liked the 200gr. Speer.
I can "see" the use of the 160 to 185gr. "X" bullets to be more suitable for smaller game at longer ranges, but allow the use of this "old" favourite ctg. and rifle.
If you need a rifle to "do it all", the .338 Mag. is a good choice.