http://abcnews.go.com/International/...ition-38966600
"To prevent that, the Czech researchers focused on developing projectiles that get deformed once hitting a target, significantly reducing the chance of passing through.
The result of testing in an underground lab is 9mm ammunition with a brass bullet, weighing about 5 grams (0.18 ounces). It leaves the gun at a speed over 500 meters (1,640 feet) per second, higher than the 350-400 meters per second that is common for this caliber, providing a sufficient wounding capability.
On impact, the bullet expands its surface, imparts all its kinetic energy into the body and remains in it."
I am just blown away.........