Elk are big and tuff. They have a rather large Lung-heart area. When one is hit in the lung heart area with a decent bullet, it will die, but not instantly. It takes time for it to bleed out, flooding the lungs with blood. The more tissue damage the less time it takes it to die. If its spooked, it can run quite a distance before it dies. But actually its a good place to shoot an elk.
Its like a deer. The best place to shoot a deer is in the brisqet area, or lung heart area. If hit properly the deer will hump up, walk a few feet and drop. If the deer is spooked, it could run a long ways before it goes down. The same way with the elk.
Lots of people shoot to break the shoulder, assuming if the legs are taken out then it cant move. Thats true I suppose, but what normally happens, the bullet is deflected and you only get one leg. Elk, deer, antelope and other critters run pretty fast on one leg. Running off to die and suffer but never found. At least with a lung-heart shot, they may run a distance, but they will die. Less suffering.
I cringe at the thought of the many dead critters I find later that have been lost and suffered because one leg was shot and distroyed.
Spine and head shots are fatal and instant. But hard to do. How many of us really know where the spine or brain is at 150 - 200 yards. Differant angles, moving, etc. Lots of muffed shots. Jaws shot off, high gut shots etc.
This is my opinion. I will not shoot a running critter. I go for a heart-lung shot and watch the critters action. It will hump up. Gut shots also cause the humping action, but its differant, also sounds differant. I like a shot at about 200 yards at a non spooked animal. I can tell how its hit by its action. I set still and watch it move about 20 ft or so and lay down. I don't do follow up shots. I watch the critter. Give it a bit of time making sure its dead or two sick to move.
Its confidence in your shooting that makes for retrieved game and less wounded and lost critters in my opinion. I don't shoot unless I KNOW, I wont miss.
Normaly I dont like war stories but this one fits perfectly. Its like one time in my law enforcement sniping duties. One time I was called to take out a large german shephard that was suspected of rabies and had bitten a child. We were given to midnight to get the dog or the the child would undergo a series of rabies shots. I got a chance at the dog, it a urban area. Made the shot on the moving dog at 238 yards. I was asked "What if You Missed" (like I said, an urban area, lots of houses and such). I told them if there was a doubt on the shot, I wouldn't have shot. No one condems one if he dosnt get a shot. The comdemnation comes from missing, or worse hitting something you dont intend to hit. Its the same way with hunting. We come back with the story we "didnt get a shot" no one says anything, but its differant if its " I shot and wounded the critter but it got away".
Its confidence in your shooting, and knowing when not to shoot. Knowing the actions of an animal that is hit in differant areas. We ow it to the game we shoot to shoot them in a humain manner. Not letting them suffer.
If you shoot, and know you have hit a vital area, wait, if you shoot agian you often spook the critter and it runs off to suffer.
Thats not to say, if you shoot one, and its down and out, but alive, you shouldnt put it out of its missory.
JMHO