I am also using KK's R26 load with the 168 LRAB, I have not tested hot weather performance yet, ignorance is bliss, and this is fine for cool weather hunting. VV 165 is another good option. RS Magnum would be worth a try as well. Please report on any 8133 loads as I am tempted to buy some and just bite the bullet on the Hazmat fee. I think it could do well in the 257 Weatherby and other magnums from 270 WSM and up.
KK I am envious of the 280 AI Forbs that should be a very good all around set up excluding big bears, but the 168 - 175 premium loads could handle that use as well.