There is basically no comparison between the 1980's BT and a BT produced today. They have been modified/tweaked a number of times and I believe Nosler has them as close to perfect (in my eyes anyway) as a bullet can get. Each bullet has undergone a design change or two in the past 30 or so years, some more than others. In the most general terms, most of the changes have been to toughen them up...in general terms.
We used them in legal culling operations on large plantations along with other makes and designs. They performed fantastic. We were required to keep meticulous records of all kills, etc and out of the last 16 years, we had one bonafide failure...that was it.
