When you buy the dies from white oak they send along some basic load data. ( only white oak sells the dies) you can also find lots of load data on the interweb but please use caution. What I have found so far is that it shoots everything that will fit in the magazine very well.
The builder of my upper is Dan Carey
Carey Custom Rifle Company
You can read about what he can build on his site. So far I have two of his uppers, a 204r and now the 6 woa.