DRT bang/flop I ever saw was when I hit a 120 pound 8 pointer "in the armpit", broadside, with a 130 grain Winchester Ballistic Silvertip from 75 yards from a 270 WSM.
Factory spec says MV is 3250 fps, so at 75 yards it was probably going ONLY about 3,100 fps or so at impact.
The buck was standing still, exactly broadside (the long axis of his body was at a 90 degree angle to my gun-target line), but when the trigger broke, the long axis of his body IMMEDIATELY went parallel to the line of fire!
It happened so fast that I didn't know what happened, at first. I lost the target image in my scope due to the recoil, and when I recovered, the buck had disappeared, it seemed.
Then I saw some small movements at ground level. Turned out it was his rear feet twitching, a few times, then total stillness. "Cessation of brain activity" for sure!
Hydro static shock? I doubt it - more like getting hit by a Volkswagen at 100 mph!