Friend without internet access is building a 378 Weatherby wirh a 32 inch barrel firing 350gr bullets. Powders of choice are MRP, RL-25, H-1000 and Mag-Pro. Starting load would be a great help.
The only 350 grain bullets I have Quickload v 3.2 data on are Woodleigh round noses... Is that what you are talking about?? Also, I assume you are loading the bullets off of the lands?