Since you are rebarreling, will go with .375 HH? And, will you hunt with it?
I do plan on rebarreling to .375 H&H. However, unless my numerous ailments are miraculously cured, I probably will never have a chance to hunt with it, although I might conceivably take a deer with it from my ground blind. I like to think of someone else profiting from my alterations. It gives me something to do in these troubled times.
In a way, it allows me to make a statement: "This is the way I think I hunting rifle should look and handle."