I believe premium ammo is worth the extra money regardless of the game but is paramount the larger/thicker/tougher the game you are hunting. I am not a fan of rem. factory ammo, but will say a friend used the ultra corelokt last fall it performed better on the range in accuracy but no better on the game end vs. reg. corelokt - in fact the ultra came completely unglued on a buck @ 100yards (3006), which required a second finishing shot. I took 2 deer with a Nolser Ballistic Tip last fall and they crumpled, thus why I choose to use premium ammo. The amount of money and time I spend hunting game a year isn't worth the saving or chance that the ammo won't perform they way I expect it to. It boils down to each their own I guess.

BTW I certainly won't recommend a corelokt or Ultra for any elk or moose hun, you need a solid bullet like a : partition, trophy bonded, failsafe, barnes x, etc.