I can only say that Nosler must have made significant changes in the BT's since I tried the originals years ago. After my first experience with them (l00 grain in a .257R) I have never used them since unless someone gave me some, then they were shot up on paper.
I know, you shouldn't make judgments on the basis of one experience. I simplified my life and use partitions in every caliber I hunt with and have never been disappointed in their performance.
How many threads have been written about various "new" bullets which the manufacturer continues to modify. For those having unlimited budgets and unlimited animals to try them on maybe this is okay. I guess I'm just old fashioned. When I find something that works I stay with it.