If you're shooting a .30 BooBoo, you are already in contact with Dave Tooley. But in general, you can use .308 Norma mag data, & work carefully up toward .300 Win Mag data. (Actually in Europe, the .308 Norma is loaded hotter & faster than the Win Mag since CIP max pressure is 380 MPa for the Norma & 370 MPa for the Win Mag. The 8x68 case is also rated at 380 MPa. Source: VihtaVuori Oy Reloading Manual.)
Powder of choice for most of us is Rel-22.