there was a study years ago where they were doing a cull hunt on if I recall a bunch of cape buffalo with a 458win mag shortly after it was introduced by if I recall Jack Lott the maker of the 358 lott a few years later

they shot something like a 100 cape buffallo in as close to the same place in the heart as they could , they kept records and found it was almost 50/50 if they ran or dropped basically stating hydrostatic shock is a inconsistent killer so you can't really count on it

I can't find the article now , so I am going off what I read and recall form years ago.

few people have shot as many moose as US and Canadian first nations have being they get different tags they have very successfully used 30-30 , 30-06 and 303brit , shot placement is important.
they also typically talk about shooting them all in the spine so they drop and don't run into the willows making a mess of recovery.

It was proposed after that hunt and study, that the heart rhythm may have something to do with it. If the animal was shot on the pressure cycle, the animal dropped. The blood was already at full pressure, so the added shot from the bullet hitting burst blood vessels everywhere. Animals that ran after the shot were hit when the blood was not at full pressure, so the blood absorbed the pressure build.