Does anyone have any published or developed load data for the 375H&H with 350gr projectiles?

I will be loading Woodleigh RN SN 350gr which I know are quite heavy for calibre and all load data I have only goes to 300gr

I did find some suggested loads but would like to get as much info as possible to help determine where I will start. Woodleigh recommends an impact velocity of 1900-2400.

Loads will be for a CZ550 Safari with 1:12 twist.
Is 1:12 going to stabilise a 350gr OK?

Cheers.