Ballistics

What kind of a projectile could cause such mayhem you might ask.
Basically a projectile can be anything that can be projected into motion through space, gravity and drag being the only forces acting on the item.
In the case of hydrostatic shock, the projectile usually will be one deigned for maximum velocity per mass with the intent to kill as cleanly and quickly as possible.
Since the invention of the modern firearm, every ammunition producer has made it their business to produce the most lethal projectiles possible.
It is not uncommon to see velocities exceeding 1000 meters/second  for performance calibers.
This is far more velocity than found to be necessary to initiate the shock:
"Nathan Foster of Terminal Ballistics Research found that it is possible to induce hydrostatic shock in Bovines providing impact velocity is above 2600fps, using controlled expanding projectiles of appropriate weights. Furthermore, using hunting cartridges between 6mm and .338 bore diameters, a nominal velocity of 2600fps or higher produces the same results on most mammals where bullet weights and bullet construction are again appropriately matched to game body weights for optimum energy transfer".
for more specific ballistics data visit this website: http://www.chuckhawks.com/rifle_ballistics_table2.htm