I think with the subsonics, on the bigger animals, its not so much the shockwave, but that there is enough 'play' in the organ cavity for things to move around a bit and move out of the way as the projectile bulldozes its way through.
I think of it like a parked car without handbrake applied and not in gear. Gets hit end on by a pushbike doing 50km/h. (like a .223) There will be some damage.
Same car same situation and gets hit by a big truck doing 2km/h. (like a subsonic .44) No dent in car because it rolls out of the way.
Another way to picture it is to push an object slowly across your bicep in a straight line, the muscle will yield, then imagine same object doing >2000fps, it would just rip a hole.
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