I would be surprised if Brian Pearce did not know how to set up a die for a Three Seven Five. I have owned four .375 H&H rifles. Two were Pre-64's, one the Sako's with the two piece Mannlicher style stock and a Mod. 70 "Classic Stainless" I fixed up and gifted to my wonderful son-in-law. As usual I prefer the Winchester action and the wonderful hunting trigger on old Mod. 70 rifles. I also felt like Winchester put to heavy of a barrel on their .375's, Ruger got it right on the .375 Ruger. I only loaded 270 grain Barnes X bullets in Winchester brass and only for one rifle with the re-sizing die set to that rifle. I doubt I ever loaded any of the brass over five times. Had no problems with the brass.
I never shot a critter with any .375 and I finally gave up on the .375 as I prefer my custom Mod. 70 .338 for my Alaska hunting. If I was hunting across the pond or dealing with brown bears in the alders on a regular basis I would go bigger then my .338.
