I think the temperature sensitivity problem of powders in Africa is a non-problem. It gets hotter in Ohio or Michigan in the Summer than it does during the (usually Winter) hunting season in Africa. You get more temperature extremes hunting deer in North America. For .458 Winchester, I have found that H4895 is a good powder and AA2230 just a bit better, because a load is denser and has little or no compression. H4895 is slightly better from a temperature sensitivity problem but, between the two, I don't think it matters much. This whole issue arose because Kyunoch ammo used cordite, which was very temperature sensitive, and hunters living in Africa hunted during hotter parts of the year.