Mods, please move this post if I've chosen the wrong sub.
I am looking for actual statistical data relating to the difference in an individual's handgun shooting performance (draw speed/accuracy) when shooting one handed vs. shooting two handed. The specific context is in the use of a weapon mounted flashlight vs a handheld flashlight and pistol. As a firearms instructor, it would never occur to me, either based on my training or on my experience, that a persons using only one hand to shoot (and the other to hold and align a flashlight) could ever out perform a person using a normal, two-handed firing grip, but apparently there are people who need to see the numbers before they can allocate the funds. I call those people white shirts, among other things.
Force Science is my first instinct, but if anyone has any hard data or can point me in the right direction, I'd appreciate it. Thanks in advance.