They've only recently started making them in .375 H&H belted on a regular basis, if I remember from my visit to the factory in March this year. His chances of finding one is therefore rather slim as he will have to look out for an 89B, and they are still rather thinly spread with no more than 120-130 having been completed yet, and precious few of those in .375 H&H belted.

He may get lucky with a much older 80B or 88B, but again, his chances of finding a .470, .500 or 9,3x74R are much better.