My Brother shot a nice mule deer last year with his .50 cal muzzy. He hit it hard. Blew front shoulder out, Heart, and lungs. The deer still managed to bound 25 yards and piled up under a fell pine tree. There was small blood spots were it was standing but nothing else. He didn't see the deer go down after the shot because it dropped below his sight in the thick cover. It took us 3 hours searching every possible exit and track. We finally stumbled over it luckily. The deer had fallen under thick cover that even though we were standing 5 feet away we couldn't see it. Point is You probably killed your elk and didn't spend enough time looking for it. Elk are tough animals and even if you hit it with a 210 grain 300 rum there is not guarantee its going to fall in its tracks. I hunt with a 7mm rem mag and I shoot 168 bergers. Most animals i hit drop in there tracks. I had a cow elk a few years ago that ran hard on me. I was finding huge chunks of bone and blood like you cant believe. She still ran straight down the canyon about a half mile and got down into the nastiest cliff and dead fall I have ever seen. I don't see the need to blow a animal in half. Hell might as well shoot a .50 BMG. Nothing is going to run after its hit with that.