So I tried the new Blk crush-rib Sabot w/ some Barnes T-EZ bullets today... WOW!
My Knight Mountaineer liked neither the TMZ or T-EZ pre-packaged combos. After I replaced Barnes sabots with the H15045BR, my groups immediately came together. I went from 8"-11" groups down to 3"-4" at 150 yds. I really wanted to stick to Barnes solid copper bullets because of their excellent weight retention and razor sharp petals. They have really made a diiference in a couple of bull elk I've taken. Damn the Knight Mountaineer is one picky rifle.
If any BP shooters simply can't bring their groups in with their favorite bullet, I'd highly recommend trying these new sabots.