Re: Which bullet for elk?
Out of the two you listed, definitely the accubond. I used 180gr ballistic tips years ago in a 30-06 that worked very well on three bulls, but I was not impressed with the bullets on one shot in particular. I thought the elk had been hit by my first shot, and it turned and ran upslope towards me. I put a round under his chin and the bullet didn't make much of a mark at all on the spine...just splashed. It anchored him right now, but I walked down to him and put a finisher at the base of the skull.
I also used a 300 WSM on two elk in the last three years and chose the 168gr Barnes TSX bullet. They shot very accurately, and I probably wouldn't have gotten a bull if I hadn't been using them. I had one shot go through the upper leg bone and penetrate through the paunch, liver, and lung to the offside shoulder. Also used it on one elk broadside at 600 yards. High shoulder shot, DRT. Bullet passed through the upper shoulder, under the spine, and exited the other shoulder. It showed decent expansion at that range, thanks in part to the shoulder blade I'm sure.
Last years elk was with a 300 RUM shooting the 200gr Accubonds. That elk took a round though the lungs at 850 yards (no bone) and the bullet showed decent expansion and the elk went down w/in 40 yards.