NBTs are fine for thin skinned game like whitetails, but I have seen them completely blow up on hogs. I would stick with weights of at least 165 grains, and preferably go to 180 grains. Either way, I would use stout bullets like the Nosler Partition, Swift A-Frames, Trophy Bonded, Barnes-X, etc. Granted these bullets are expensive, and very heavy duty, but hogs are not slouch. You can use your NBTs on hogs, but remember me when they run off after you shoot them, and you never see them again. :grin:
Zachary