I've used some of the Sierra match king, Different Hornady Target bullets, Cor-Bon Lapua Scenar, Shot placement I feel is the most important IMO. I shot all these bullet at a steel plate and sand at 100 yards 600 yards, 1200 yards from my Custom 260 Rem. They were in the 120ish grain to the 140 ish grain. No of them mushroomed at all. At 100 yards they all just fell apart except the Cor-Bon. The thin outer layer that was wrapped around the core just shredded. The core didn't do anything. You can tell it hit something solid but I wouldn't call it a mushroom. The only one I would consider using for a hunting bullet would be the Cot-Bon Lapua Scenar. It was the 123 grain. I shot all these bullets at a pile of sand in Brawley California as well. After my testing, I did harvest a doe at 90ish yards in Cisco Texas. She did not even flinch. I was telling myself there is no way I missed that shot. My friend and I found her about 3 hrs later. The grass was about 3 feet tall. We lost her in the trees and saw a deer running off about 800 plus's yards away. We thought that was here. It wasn't. We found her about 40 yards from where I shot her. It was a clean heart shot. The heart was disintegrated. There was no trace of the bullet. I'll see if I can find those pics of that doe and the impact. I'll post them for you.