Its in his excellent book "To Ride, Shoot Straight, and Speak the Truth".
308 might be satisfying but it will overpenetrate.
22 lr will ruin the perp's day but probably wont kill him, especially if judiciously placed.
Just pick'em up at the hospital.
Yes, that's probably the right answer; I'm overdoing it for effect. And the Israelis were doing exactly that, I think with scoped, accurized 10/22's, for Pali riots, for a time. A .22 to the leg takes you right out of a riot.