There always has to be one.
I can't possibly see a place where a 338 Federal offers much over
A 180 out of a 308.
Make it a Partition, and it would be fine any where on this continent.
But, I'm boringly practical.
I'd say you hit it on the nail head. find out how it shoots, if good , develope a heavy bullet load win / win. never in today's world you gonna find 338 federal or 358 ammo as easy or inexpensive as 308...mb