I have used the 165-grainersin the .308 Winchester at a MV of 2800 FPS. My impression of them is that for a cup-and draw bullet, the HPBT's are a pretty tough bullet! I have only shot whitetails with them, but they went right through, and the deer was dropped on the spot. Can't say whether they mushroomed or not, but the results, a dead deer, were quite satisfactory!!