maddog,
I have used the Remington Safari ammo with the 300 gr Swift A-Frame on buff and the Trophy Bonded Sledgehammer Solid on hippo, both worked well in my H&H rifles.
If I was going back for more buff I would use my .375 Ruger with the 270 gr FailSafe (I have a couple of hundred put away). If those were gone, I would go with the Barnes 270 gr TSX.
good hunting...jim
