If the .375 H&H is indeed a 50,000+ cup round, this rifle will not be built in this caliber. The action is deemed safe for rounds in the 45000 cup range.

I have no concern about me shooting safe .375 Flanged Mag loads in the rifle. I just don't have control of what the next guy will do.

I will build a 450 Musket # 2 or .375 2 1/4 flanged on the action instead.