http://en.wikipedia.org/wiki/Hydrostatic_shock
here is one opinion..
i just know that it is not a worry that consumes me as i shoot and a well placed bullet does massive tramua with a PP 175 grain 7mm Mag Rem at any range up to 1100 meters
i do also know that i will not shot a animal bedded again in the heart again as the blood shot was massive and wasted both front shoulders..
at 450 yards pic attached for the trolls
001 (2).jpg
i have not open up the brain and look for it though
David