This stuff looks devistating if only it would be avalible to civilians, and looks alot safer because of the reduced penetration http://www.polyshok.com/ballistic_gelatin.htm
another link http://www.military.com/soldiertech/0,14632,Soldiertech_Projectile,,00.html
another link http://www.military.com/soldiertech/0,14632,Soldiertech_Projectile,,00.html