Does anyone know what bullet remington loads into their 270gr SP load for the 375 H&H Mag?

Those loads shoot really well in my rifle and I want to try and duplicate them. They are great meat bullets for deer hunting. The factory loads are better on meat than any other bullet load combination I've tried out of any rifle, alot less ruined meat than 30-06.

My guess is that they are loading Remington Core Locked bullets. You can buy bulk Remington bullets from several sources but I've never seen .375 bullets for sale.

Some years back when I shot .375 I wondered the same thing.
The Rem factory rounds I saw looked very much like a Hornady 270gr RN.
Hornady has made bullets for Rem before.