I will use an HP for deer but ONLY after testing to verify the alloy, heat treating, and velocity are in balance with one another.
I have shot a few deer with a pure lead 457122 at 1600+ fps. This was using an inline ML, Pyrodex pellets, and a sabot. Bullets had been sized to .452 for proper fit in th sabots. At 100 on the berm they opened to the size of a quarter. On deer they always exited on broadside shots and left a larg exit wound. Tracking was easy, it looked like a leaky paint bucket. Had the bullet been cast of a hard alloy I bet results would have been less satisfactory. Nose blows off, penetration suffers, and possibly no exit.
Balance guys, it is all about balance. Think about it Jim, I believe I remember you speaking of how reducing velocity in some handguns gave better results. This isn't much different.