Early hornady dgx. At the time they were significantly cheaper than partitions and shot shockingly well in the accuracy department. On game use they acted like an fmj, or at least the first few did. Eventually got about 100 milk jugs and decided to test a pile of them. 3 of 10 did exquisite almost textbook mushrooms, others held together so good you could probably re shoot them. Found they reliably opened 3/8 mild steel and thicker but it was roulette in anything less. We don't have a lot of up armored bears so it was back to partitions.
Maybe the new ones are better, but I've been burned enough I'll never try....