Uall

Just remember that Grouse's load of 130 grains of BH is still greater than TC suggests as the max load in any TC. Even though the pressure created by 130 grains is less than T7 with a 300 grain bullet and below. As you go up in projectile weight the pressure spike also rises very rapidly with BH.

TC does say 150 grain of Black Powder is max. But uall remember that T7 is rated 15% hotter than BP or Pyrodex. BH is also considered to be 15% and can get much greater as the projectile weight goes up.