When they brought out the BT's they still had the same data listed for all bullets within the weight for caliber to be used with them all.
I personally have always felt they dropped the ball when they discontinued the SB's as they are a great bullet that I still use today in several calibers. They can make all the claims they want but for a pure hunting bullet it is hard to beat.
Like those above mention, if you have a load worked up for a 55gr bullet, drop it down just a touch ad work it back up with the SB. It will shoot and knock the daylights out of things.
I just wished I had bulked up on them a bit more when I had the chance. I have never had one of the BT's give the same performance. Accuracy absolutely, but penetration without blowing things apart not even close. I have several hundred of the 120gr SB's for my 25-06 AI that once gone, I guess I'll go to the 120gr Core Lokt as it gives as good of performance as the SB with only a touch less accuracy at 300yds. But when your talking 3/4 - 1" groups verses 1 - 1.5" at that distance for hunting it ain't too shabby.
Good luck, may they shoot as well for you as they have for me.