I have had the opportunity to use two brands of bullets in Africa with my .458 Lott so far.
The first one is Barnes that is known by everybody. But at that time, I loaded a pretty lightweight bullet for the caliber, because I used the TSX 350 gr. It worked great on plains game from warthogs up to girafe. It also offers a flatter trajectory in comparison to heavier bullet commonly used.
The second brand that I'm using now is far less known. My bullets are made in the north of Belgium by Wim Degol. It's a family business and they provide excellent quality bullets. I have heard they export now quite a lot of their production into the USA. In African calibers, they have a kind of triad bullets like the ancient A-Square's.
-The Lion Load is a soft nose. It is a bit shorter than the 2 others, because its jacket is pretty thin in its front. But at the opposite of the Lion Load from A-Square, its core is bonded and the rear of the bullet has a very thick jacket. It provides a quick expansion, but also a great weight retention on game. I used it quite a lot with a total success on many plains game.
-The Starkmantel is also a soft nose bonded bullet, but it is toughter and it provides a great weight retention. Great bullet for buffalo and girafe.
-The Vollmantel is a FMJ bullet with a very thick jacket at the front, and the lead core is also bonded.
I'm using only the 500 gr category in .458" and they shoot the same POI very easily in my rifle. They work great on games and they are pretty cheap in comparison to others.
