I'm looking for a hunting round that uses the 123g Winchester .310 Power Point bullets. I can't seem to find the proper recipe.

Factory loads off the shelf seem to be more accurate than any hand loads I've played with. Any additional information would be greatly appreciated.

I'd start here:

http://www.hodgdonreloading.com/data/rifle

Either Accurate 1680 or Accurate 2015 with 123 grain Win PowerPoints gets me sub-MOA for 5 shots in my CZ 527.

If I had to pick a single powder for 7.62x39 it would be Accurate 1680.

4198 is a good one too, as is RL-7

All of my accurate and fast loads for the 7.62x39 are using TAC powder.
CFE223 shows some promise as well but so far TAC has it hands down 120, 123, 125 and 130 grain bullets.