Most times I've seen a bullet fail it's really the guy shooting failing to use the right bullet for the job. A soft, squishy bullet will grenade when driven hard. I hard bullet like the dg-x really isn't designed for anything other than a mild mushroom.
I had a failure from my 7-08 shooting 120 Sierra's once; I was an idiot and hit the shoulder with the pill. It should have been in the slats. I shot that deer with a 44 to put it down, then tossed a left hook into the mix because it was still suffering.
Everyone can send me their failed Hornady sst's, Grand slams, and Core-locks that they no longer want. I've had decent accuracy luck and good on game luck with most bullets I've used.