Been taking elk with a Tikka T3 LS 270WSM with 140gr Accubonds since 2004 at various distances - one shot kills. My elk this past season pretty much flipped over backwards after being hit and never got up again - double lung. Great caliber. I'm very impressed with it and the performance of the Accubonds - so I would say 150gr Partitions would do the job. Shot placement.