I have miss placed my Woodleigh reloading manual so can not give a definite answer. However as the 350 mag came along after and is the more powerful of the 2 I can not see why not. Remember a350 Rigby mag can be loaded to equal the 358 Norma Mag with no problems.

Found the Woody manual. It does not list the 310 projectile for the 350Rigby Mag. However other loads for the two are similar velocities.

AR2213sc or similar would be a good choice of powder to start with.