I just spent some serious time with the Nosler boys and it seems that they remodeled the 180-grain .30 caliber Ballistic Tip a couple of years ago. Now it has basically the same tough, heavy jacket construction as the bigger BT's, such as the 200 .338--which explains why some of the Campfire guys have had such good luck with it even on heavier game.
The changeover came not quite two years ago, so any 180 .30's now available have the heavier jacket.
RE: interesting information about 180gr ballistic tips
That is interesting, because they also changed their offering for 8mm (.323) from 200 grains to 180 grains. I guess that might explain why they did that.