I went on what was initially only a PG hunt to Free State and Limpopo this last July. I will readily admit that I am certainly not an expert on anything, but I did a TON of research regarding loads prior to my trip. When planning, the only loads I could source were the Hornady DGS and DGX, both in 300 grain. I had read many horror stories of the original DGX line, but also just as many positive experiences with the revamped bullet. Again, these were the only loads I could find prior to my trip, so that is what I practiced with and subsequently carried while hunting. I did not use the DGS on game, so I cannot attest to their effectiveness. However, everything that I shot (with the exception of several jackals and pigeons) was with the DGX. Again, I am no expert, but the bullets performed flawlessly.
As stated, this was initally a hunt for PG. Upon arrival at one of the camps, I was offered the chance at a buff, which after several days of hunting, I finally got an opportunity on. Initial shot was from about 20 yards. 1/3 up the close leg, right into the vitals. Upon recovery, the bullet mushroomed well, and held together (a major complaint against the initial DGX bullets). Penetration was all the way through, and it was buried into the hide on the off side. I have not weighed the slug, but I would be willing to bet that weight retention is somewhere in the 90%+ range.
Both the outfitter and PH were very well satisfied, and even impressed, with how this bullet performed. I am always tinkering with the idea of improving anything that can be improved upon, and as such, I asked what would be the best bullet I could shoot on future hunts. Outfitter and PH agreed that they would not hesitate hunting anything with this load.
I know that without an actual recovered weight this is purely anectdotal, but I hope this helps, or at least offers some insight.