I have had some different experiences with the 140/7mm BT from an STW, and the 150 BT from a 30-338 Mag. They were basically bombs, but in all fairness, this was when they were first released, not any of recent manufacture. Regards, Eagleye.
Many people are not aware that there have been many changes to the ballistic tip line over the years.There have been up to four versions of some particular bullets,which each version being tougher than the previous one.
I have been using the 140gr ballistic out of my 7mmstws since 1990,and the changes in that bullet have been significant.The early versions in the green and red box of 100 were very soft and although they provided dramatic kills,they did not penetrate well if bone was struck.The jackets were thickened considerably soon after,and the following version/versions usually exits deer even at close range when driven at 3500fps.
The 180gr .308" ballistic tip has undergone even more significant change.The first reason was very soft,but the latest version that has been out for about six or seven years,is actually quite tough.I have sectioned both,and the jackets are much thicker towards the base.I have personally taken eight elk and two moose with the latest version,with great results.Driven at 3340fps out of my 300 ultramag,the latest version has penetrated both shoulders of a mature bull elk,and most have exited.
I have loaded the 165gr .308" version for friends ,and it is much softer than the 180gr version.It works well in the 308win and 30-06,but I wouldn't use it for large game at higher velocities.
The particular bullet that I hear the most complaints about is the 130gr .277" ballistic tip.For some reason,Nosler elected not to toughen that bullet up nearly as much as many others.
I have also used the 100gr .257" version out of my 257wby at 3500 fps and it works well for lung shots but makes a mess when a shoulder is struck.