Just so it's clear- "hydraulic shock" is not a wounding mechanism, and water jugs are not a replicant for tissue. It can be used for comparison between bullets, though you will see much more expansion from water than you will in tissue or ballistic gelatin. For instance the Hornady 115gr 9mm XTP consistently fails to upset (expand) in both tissue and ballistic gel, yet nearly turns itself inside out in water.
Those bullets that show "beautiful" expansion in water will not expand/upset nearly the same in tissue. Bullets that fragment in water will not necessarily fragment in tissue.
