The rotors will bring a lot of energy into the equation on their own. It may be sufficient just to put some steel or lead in their path. I'd be more concerned

The rotors will bring a lot of energy into the equation on their own. It may be sufficient just to put some steel or lead in their path. I'd be more concerned about the crashing drone than the shot. People are hit with falling shot fairly regularly when bird hunting and as far as I know it's not considered a serious problem.