Actually in the 52cal with a Powerstem plug the Blackmag TB tested gave the highest fps with a 375gr bullet and less powder than T7. BH209 still beat it with a normal plug. One of the Randys on Hawks site had a similar result. The first bottle was garbage and the next was fine with FPS as good as T7. A while later Wakeman ranted and raved about it because the Savage shooting team did well with it at Friendship.

Oops that reminds me, i have a powerstem type vent i can try too.

Kinda got to sort through the BS and see if it works for you and the application.