Just remember that you should add about 15% to what you get from real black or pyrodex when comparing powders/ charges. In other words, a 100 gr charge of BH by volume would equal 115 gr of black or Pyrodex. So when you add 15% to your 114 gr/volume, you are really shooting the equivalent of 131 gr load. That is a lot of powder!
Not sure what you are hunting with the 270 gr platinum powerbelt, but that bullet could blow up if it hits anything substantial (bone) going that fast. Powerbelts are SOFT pure lead bullets. The "platinum" is a thin skin around the lead and does NOTHING to increase the toughness of the bullet. If you don't believe that, call the company, they will tell you the same thing. It is NOT a protective jacket. The only thing about the bullet that makes it hold together better is it has a smaller hollow point at the nose.
I switched to the Hornady FPB because they use a lead alloy that holds together better than powerbelts. If I still used powerbelts, I would not exceed 100 gr of BH 209. Harder you push them, the more likely they will come apart on impact. Send it thru the ribs/double lung, and you are great, but if it hits a bone, you could be in for a nonrecovered animal. Soft lead does not like to be pushed too fast.
See my post on the FPB and elk. They have a 300 and 350 bullet. After shooting them at tough game (elk) I will never use another powerbelt. That said, they many not load in some CVAs that have smaller bores
venor, ergo sum (I hunt, therefore I am)