My 275 Rigby has accounted for some Elephants and other various African game. The original owner never polluted it's barrel with soft point bullets and used 173gr military ammo. The 160gr that you picked should be a great killer and will do the job on elk with no problem if kit properly.The Ruger RSI is a great little rifle, my brother shot a whitetail this past season at about 280yds and it dropped in its tracks with an RSI.