I've taken 23 elk with Nosler Particians before Accubonds came out. I have shot them with 25-06, .270 and. 338 Win Mag. I went to a 180gr. Accubond in my 338 WinMag and have taken 9 elk between 80yds and 723yds with the 180gn Accubonds, never having to put an extra round into any of them.
For whatever reason, I get my best groups shooting my 338 with the 180's at 3318fps. The Accubond I took the elk at 723yds didn't expand much, as it missed hitting any bones but, it penetrated the lungs and ended up in the opposing front shoulder socket, bent at a 70 degree angle. I wouldn't shoot this load again at game at that distance. I've taken my last 5 elk, one with my 6.5 Creedmoor, one with my 300RUM custom long range rifle and three with my 7mmRemMag, which is what I will finish my hunting days with.
I shoot exclusively Accubonds in my 300RUM and 7mmRemMag, without any worries about whether they will drop the animal or not, because of their past performance.