Start low and work your way up. Look for Pressure signs, 88.0gr of H-1000 or Retumbo usually does it.
Mine likes 90.5gr of H-1000 or Retumbo
Primer- Federal or Winchester
300gr SMK's are great and do not care to be near the lands.
Make sure to seat the projectile in various Lengths (JUMP from lands) as your rifle will like its own measurements.