I've only killed 9 or 10 caribou, and am no authority on bullets. Caribou are not that tough, IMO, and can be cleanly taken by most "deer" bullets. I killed mine with factory Rem core-lokts, but would use 150gr NPs if I were to go again (only because they are quite accurate in my 270). For the 7Mag, I suspect any good 160gr bullet would do well. I saw lots of caribou taken with 7 mags, again using core-lokts, so any of the better bullets available today would be "gravy".