Is there any material reason to pick one over the other?
I would consider the NAB to be an above average elk bullet, and the frangible Bergers to be some of the absolute worst. I've seen numerous problems with them on elk. In one case where the animal was recovered, the bullet fragmented on bone going in and the little stump didn't track straight and stopped in the near side lung leaveing the animal with one good lung. The hunter was lucky they saw the animal go down - almost a half mile from where it was shot. In other cases the animals were lost and one can only speculate. I'd look at Accubonds, Terminal Ascents, Partitions, Weldcores, Sciroccos, A-Frames, LRX possibly but not Berger.
