In the Saintsbook, there's a challenge from Shaundi to make 25 Nut Shots. However, I'm having difficulty pulling this off (I also had a hard time completing this challenge in Saints Row 2 and was never able to get 3 gold stars).
I'm currently dual-wielding 45 Shepherds to make my attempts. I was previously using a shotgun, but it seemed to be just killing the guys before I received credit for the Nut Shot. Sometimes I see them grabbing at their groin in pain, but I still don't get credit.
How can I effectively complete this challenge? Does this have to be a killing blow? Does it have to not be a killing blow? Is there any particular weapon that is better for this challenge?