A shot an elk at 300 yd with a 175ELDX out of a 7WSM. Going 2960 with RL26. Shot placement was perfect, but the bullet hit a rib right behind the shoulder. The animal put its head down and started walking forward and then turned around and I shot again and hit it on the other side and then it turned around and started walking in the opposite direction again and I chambered a third round amazed at what I was seeing. The animal finally collapsed and when I got up to it to gut it, I saw both entrance wounds. When I pulled the guts out all the organs up high that were against that rib cage on that first shot were shredded. But there was no penetration. When we hung it up and pulled the hide off, you could see what happened. There was a silver dollar sized hole right in the middle of a rib bone. The second round did its job but the first round just grenaded and was superficial. The second round did it's job but it certainly wasn't DRT. What's worse is that I shot those bullets into pork shoulders at 200yds, two weeks prior to the hunt and I was disappointed with what I saw. They were explosive and there wasn't a bullet core to recover. I was able to find the cup of the jacket, mangled and very incomplete. Pieces of copper jacket, red tip material, lead fragments. I ordered two boxes of 175gr Nosler Accubond LRs but the retailer was slow to ship and I didn't have time to load dev, shoot at distance, and all that. The rifle shot the 175ELDXs really well so I just went with them. But I did my homework, saw the results, and just didn't have time to heed.
After the hunt, I did some cursery loading of the Accubonds and they just shot okay. Never used them, instead went with Barnes 168gr LRX.
It's one thing to blow up bullets on Antelope and mule deer. They're small enough that that will work. But I think elk just cross the threshold to where every once in awhile that total energy dump doesn't make it deep enough. Hence a bonded bullet.