Impossible. There are two ways to incapacite a person. One is a hit to the central nervous system, i.e. spinal cord/brain. The second is through suffocation, i.e. blood loss. As for the first, any well placed shot from any firearm will do. This is the ONLY way to 'drop' a person.
As for the second, no matter what someone is hit with, it will take time for them to bleed out. Yes, some rounds work better than others, but nothing is going to create a 100% chance of incapacitation.
The magic word is "incapaciting." See #73 for how they describe "incapaciting." It does not have to be instant, or even eventual death. It only deals with the perps ability to return fire AND escape.
Call your nearest FBI field office and tell then they're full of beans.