a 150/180 grn 30 caliber bullet at anywhere around 1500 to 2000 FPS is certainly adequate for deer, moose,elk or black bear, it really doesn't matter what brand of rifle the bullet originated from,,,
the key is "bullet placement"
a deer can be wounded and lost and suffer from a 30-378 Wby shot, if the bullet is not placed well!
or deer can drop, like a rock, from a 55grn .223 Rem !
the 30-30 Win has probably killed more big game in NA , than any other caliber,,,
and very humanly in hands of capable marksmen,,