You may find that load data is not available for the exact bullet weight your mould drops.

My .375 mould drops 360 grains, my .416 mould drops 416 grains.

You're pretty much on your own here, so take the necessary care with load development.

I've ended up with 416 grain .416 at 2070 fps, and 360 grain .375 at 2050 fps. I can push them faster, but this makes the required power factor. These loads are adequate for range practice, and close enough to full loads so that the difference experienced in the field is not obvious.

I base power factor on the BASA formula. The minimum power factor for .375 is -----, and for .416 it is -----.

From the chart below, you can see that the achieved velocities make the respective power factors for BASA.