RE: Max load of APP 3F
Welcome to the forum.
Since APP measures like Goex or Pyrodex. And you're shooting an Omega. I think I would set the max at 120 grains of loose 3f. I shot that out of my Knight Disc. Then start your load at 90 grains and work for accuracy and if 100 grains is most accurate, then that's the load you should use.
At the web site they do not even mention the max load of 3f. They have a 240 grain with 120 grains of 2f running 1900 fps. I would have thought that it would have produced more then that. Maybe the 3f will work for you. I did not have as good a luck with it as I thought I would...