A partition is a great bullet as is the 6.5 creedmoore however a elk is a really tough big animal . People underestimate the bone structure of a elk . Even rib bones are getting close in density to the biggest deer bones. I always prefer heavy for caliber bullet and if it's going to be a smaller cartridge like a 6.5c then u defiantly want to hit them in the heart and lungs . Many elk have been taken with much smaller caliber/cartridge , im not saying the won't do the job but we as hunters need to be ethical in our choices also . 6.5 with a heavy premium bonded or solid bullet with handle anything in N America . Let shot placement be the limiting factor in the yardage the shot is taken from so you are sure to hit heart and lungs .