>>.22 is about as effective as a slingshot in a battle situation.<<
Until you get hit in the face with a .22LR. Make you kick and scream and cry for mama.
Funny you say that. #4 buckshot loaded right has a very similar velocity and weight as 22LR out of a shotgun. Except it all arrives at once, 16 or 17 pellets in a 12ga a few less in a 20ga. The question is you want some?