375 rum

Hi I was wondering if anybody would be able to run a quickload for a 375 rum with a 350smk seated at 4" OAL. Finally finished my rifle but am at a loss for max case capacity and where to start out and with powder so scarce don't want to burn through lbs of powder trying to find which one will...

Does anyone here shoot one? I was originally thinking of doing a CheyTac build but I already have a 700 donor long action in the safe I could use I believe. Or am I wrong and the bolt face won’t work? It’s a 7mm mag action originally. But if the action will work, are any of you here using one...