Zanelike - No offense, but I've never hunted, or seen hunted, blocks of ballistics gel, and don't really care what they do when shot.
What I am saying is that, in my experience, shock itself (when deliverd by a bullet) is not a very reliable killer.
Lots of people, including those killing hundreds of animals on a cull, will report that, even when pretty much identical animals are shot at identical places, at identical ranges with the same rifle/load combo, some die on the spot (shock kill) and some get back up and die of blood loss/organ failure (no shock kill) later on. I have experienced this many times myself.
And I specificaly did state that shock is real (I have killed animals myself that died instantly on the shot, and the instant fatality could only be explained by shock), I did not discount it completely.
I have just seen many more small/fast hunters relying on shock to kill, end up shaking their heads wondering what went wrong, than guys shooting big/slow wondering what went wrong.