I used three of these bullets as finishing/anchoring shots on a Western Savanna Buffalo in Benin. The report of this hunt can be read somewhere else in this forum.
I carried three rounds loaded with these rather light and soft bullets as medicine against lions, in that particular hunting area in Benin there are some nasty lions, even man-eaters. So when the buffalo was down I just wanted to anchor him as good as possible and shot all three rounds into his heart area with quartering-away shots from a distance of about 10 meters.
Two of the bullets were recovered by the skinners, one was weighing 186 grains, the other 247 grains. That means a weight retention of 53% and 70%, not exactly the performance I expect from a bullet to be used against buffalo.
So I think they are ok for plains game and cats but for heavy thick skinned game I would prefer something more sturdy and heavier. Just MHO of course.

Kalunga