You will have great results with the 140g Accubond. I have three 7 mags, the Savage 114C shoots the 140g Accubond with three bullets touching at 100 yards with the following load.
Rem brass
9 1/2
66.5g of H4350
140g accubond touching the lands
3240 fps in this Savage Rifle
I have had bad luck with the Sierra 140g SBT. I lost a fine deer and several does shot with it. In my opinion, it is best shot in a 7/08 with less velocity. I have had great luck with the Sierra 160g SBT, nothing short of fantastic bullet. Last year I loaded the Hornady 162g SST for two guys that were going to Africa for plains game. They each killed 12 animals with only one shot kills, dropping in their tracks. The guide was so impressed at the bullet's preformance that he wrote an article in a Magazine about it.
If you read my post above, I hope that you will see that I'm talking from experience on the 7 Mag and the 140's. If You are hunting the Kibab or up on the Rim, the 140g Accubond will be a great bullet. I doubt if you will have to shoot over 550 yards, and you are going to have to have some STRONG glass to shoot that far. Practice, practice, practice!
Good luck!