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I only have 1 buff under my belt, so I only know of TBBC by reputation - they work as well as any other bonded premium like A-Frame and North Fork. I've heard/read that that's all some buff hunters will use. They work
I shot mine (a cow) this past August with a 9.3x62 (slightly less potent than 375H&H) firing 286 gr Swift A Frame at just under 2500 fps. 1 shot is all it took. She ran away, as most buff do, perhaps 50 yards, crashed, gave her death bellow, and that was that. I had a perfect broadside as I began to squeeze the trigger, but she turned at the last second and I ended up with a raking shot on her left side - the worst shot angle on a buff. That bullet penetrated between 3 and 4 feet.
A bullet with controlled expansion - where expansion ceases somewhere around mid-shank even though the bullet is still penetrating; or a copper bullet like TSX, though with TSX, expansion ceases near the top of the shank. Some expansion is good as it creates a wider permanent wound channel than a solid. Too much expansion is less desirable because the wider it gets, the more it inhibits penetration. Every bullet we've all talked about here will do the trick, and the easiest 375 H&H ammo to find in the US will be topped with TSX, A Frame, or TBBC. You can't do better than those.
Get a copy of Kevin Robertson's "Perfect Shot" or "Perfect Shot 2" - the graphic above was copied from the latter, but Jerome (
@AfricaHunting.com) has a whole section on this website dedicated to shot placement, illustrations included.