I have never used the partition on buff, but have had excellent success with the A-Frame and Barnes TSX in .416 Rigby. Both look like catalog pictures when recovered.

While on a recent leopard hunt, I shot a 55" kudu with a 225 partition out of a .338 WM. We recovered the bullet. There was no lead left and very little of the base. It did, however, kill the Kudu from about 180 yards. The Kudu is a "soft" animal. Cape Buffalo are "hard" animals with no sense of humor. For "hard" animals, I prefer "hard" bullets. YMMV.