We had some pics of what a single shot .50cal can do to a full grown doe at 600-700 yds when she is shot at the proper angle.....Suffice it to say she didn't need to be gutted....

The round proceeded on through a 6in diameter sappling and off into the woods.
You probably were shooting AMAX ammunition which undergoes total jacket/core seperation as passing through flesh. This creates rather large wound channels, to put it lightly.
Contrary to this .50 MG Ball and API ammunition does not fragment or seperate in personnel, and as I've seen a moose shot with .50 AMAX <video> and personnel hit with .50 Ball <images> I can tell you they don't correspond. It's about as different as 7.62mm M80 to .308 JSP's.
.50 MG Ball can still take off certain limbs at some angles, depending on the limb thickness and if you've punched through a barrier (causing yaw) or not.
I can post pics of .50 MG wound channels in ballistic gelatin if you'd like, I have 4 images: 1 AMAX (which most people have seen), various Mk211, and also an illustration of M2 Ball.
Also, regarding the videos of moose-hunting with .50 MG, they do move slightly when hit by the round, but they most definitely don't go flying. They of course do weigh alot more than people, but they'll also take more damage from any bullet that penetrates through them because they are much fatter than people - if a bullet penetrates through a 180mm wide person it only does so much work, whereas if it penetrates a 400mm wide moose (for example) then it's going to have done MORE work to that animal.