@tarbe, OP mentioned 180's don't shoot well in his rifle.
@Velo Dog, I don't disagree that 165's in the .300 Win Mag are way faster than necessary in the Limpopo. But the TSX/TTSX bullets from what I can see can't be driven too fast, too slow is the bigger worry causing them to not open as well.
All that said
@Kudurifle, I like a heavy bullet too. It may be in some circumstances overkill, but there's really no such thing in my mind. My personal favorite bullet as many here know as I harp about them all the time is the North Fork Bonded Cores. A very similar bullet with regards to performance is the Swift A-Frame. My M70 in .300 Win Mag got along with the 200gr A-Frames fairly well, but did better with the 200gr North Forks. I'd use that rifle with the 200gr North Forks to shoot at any PG to include Eland. In fact I killed an Eland with that load.
The North Forks aren't cheap but neither is a trophy fee for a lost animal. Not sure what powder you're using with the 200gr Accubonds, but I found that my M70 shot those well too with H4831 for 2850fps or thereabouts. The same powder worked well with the North Forks and A-Frames. You may want to give them both a go. The North Forks can also be ordered in 20 bullet sample packs if you just want to try them and see how they do.
I will also say this about the North Forks, they're a bit picky on brass. Because they're cut much closer to your bore diameter of .308, they're more sensitive to a good consistent neck concentricity. As such I always now load them with either Lapua or Norma brass.
If you go with an A-Frame or NF, you'll not get that great BC that the Accubond gives, but you're bullet will weigh roughly 90% or more of it's original weight and give great penetration. I'd simply characterize where your bullet is landing at 300 yards with a 2" high at 100 yards zero.