You know there was someone that decided to test this "knock down power" stuff a while back. He got a thick steel plate and stood behind it and held it at arms length. Someone shot the steel plate with a big bore rifle and the steel plate hardly moved at all. Surprisingly enough he stayed standing.[] Thousands of pounds of Kenetic energy VS. about four hundred pounds of man and steel.

A bullet will not knock anything down no matter how big the bullet is. A bullet kills by massive shock and destruction to the system not by brute force. A shock wave travels through the body and sometimes when it is close enough to the right parts it causes enough trauma to the nervous system to cause an animal to fall.