I am trying to gain information from individuals, instructors, etc, on improved shooting skills from individuals going from a .40 to a 9mm. I have heard of it, the mental thing of going to a caliber that doesnt have such a snappy recoil and smaller framed peope shooting better but I would love to see any numbers or articles if ya'll know of any. Any help would be greatly appreciated. Wanna kill these ads? We can help!