Given that you live in Alaska, things are different for you than it would be for us down here in the lower 48. There is no doubt that a non-premium bullet can work on caribou. BUT for most of us who see such a hunt in such a spectacular place, (and likely at such an expensive price), the additional overall cost of about $5 to $10 per box of ammo for premium ammo for that "added insurance" is hardly worth thinking about when the total cost of such a hunt should be in the thousands.
Also, "premium" nowadays means different things. Nosler has both a Partition and a Ballistic tip. Both are "premium" bullets, but both serve two different purposes. I think that most of us would select a partition over a ballistic tip.
Zachary