I also have seen wonderful results with the Winchester 180 grain power-points.

If you don't mind spending the cash the Federal loads with the 180 grain Partitions are probably as good as you can buy as a factory elk round.

You say "bullets" but from what I read I am assuming you are speaking of loaded ammo. Am I correct?
If not and you are indeed speaking of bullets (as in hand-loaded ammo) I would say any bonded bullets of 165 grains or more, any Solid Expanding bullet (Like Barnes or Hornady GMX) or A partition bullet like Nosler or swift would all be excellent.

But the above mentioned 180 grain Power Points continue to amaze me as to how well they work on elk even when I hand load them.

If you can get a straight wound channel and an exit, all the rest of the facts really don't matter much. 100%----- in and out---- is as deep as any bullet can go, and if you get a good diameter wound channel in a fairly straight line you'll have a dead elk.
It's the hole that actually kills, not the bullet per-se.