In another discussion I posted my African experiences using the new Hydro in 300 gr .375. To cut to the chase, it is an exceptionally good solid. In my R8, it was exceptionally accurate, and It seemed to do measurably more damage to an animal along the wound path than a traditional solid. HOWEVER, it is still a solid, and I, at least for my purposes, have concluded it should be reserved for applications where solids are appropriate. Antelope such as waterbuck and nyala, died reliably to chest shots, but all walked off significantly farther than what I would have anticipated from a similar shot from a quality SP. By the time I took my buffalo and eland, I had a magazine full of 300 gr Swift A-Frames. I should note, the Hydros worked well on small animals (duiker - even a suni) just like any other solid. The PH with whom I left them has used them on finishing shots on several elephant, and was greatly impressed. They would likely be my first choice for a tusker.