DF,
I recall that was Reagan as well.
Kevin Thomas tends to just laugh when somebody (which is occasionally a younger PH) claims Partitions aren't adequate for buffalo.
Partitions are never a bad choice. My benchmark.
I will say that I have up to a half dozen cape buffalo down from the 250 TSX in the 9.3 x 62, and another 5-6 that others have taken with my load. Never failed to bring them down quickly. I have confidence that the you'd see the same in the .375 H&H.