The powder that they use is going to be a trade secret and likely be slightly different than what we could get from hodgdon, Alian et all. As for the seating depth, just take a factory round and measure it.
If your friend is going to load for you, just have him work up a load for you. There is likely more than one "Holy grail" for your rifle.
I used to re-load but now I "hand-load".
-- Well, at least I try