Hence based on velocity, a .223 traveling at 3000 fps should produce a greater hydrodynamic effect than a .50 cal. traveling at 2500 fps.
Wrong.
First of all standard military ball is traveling at 2750 from a 36 inch barrel. That puts the energy figure a bit over 12,000 FPE's.
I'd be willing to bet that its a standard FMJ bullet. For those that dont know, the FMJ bullet is jacketed with copper, the bullet is actually made from steel,not lead.
Anyone that has ever shot a .50BMG at ANTHING knows that a .223 isnt even close to the .50 in terms of "hydrostatic" shock. As an example, try shooting a concrete block with a .223 and see what happens. It might make a hole in the block, it might choose to disentegrate without even penetrating. Shoot the block with the .50 and the block will dissappear and it will turn to dust.
On a soft target such as a watermelon, the .223 will do a good job of busting it. Shoot the watermelon with the .50 and you will have a hard time finding any of it within 25 yards of where it started.
I have several .223's and everything in between up to and including the .50. Everything pales in comparison. After shooting several dozen rounds through my .50 BMG rifle, even the .300 magnum seems like a pipsqueak.