Knock Down power is just a miss-leading term.

A larger bullet can do more damage than a smaller bullet of the same shape...

A bullet with more velocity will travel/penetrate bettter than a bullet with less velocity...

bigger bullets at faster speeds have more potential to do more dammage...But Small projectiles at slow speeds kill none the less.

Q.Which bullet would i rather get shot with a .22 or a .50?

A.Neither

Big guns are more fun to shoot tho>>[8D]