The 21' rule apparently is a myth. The FBI statistics that so many people cite for their source is based on reports of fatal officer shootings. The FBI does not gather data on actual distances of self-defense shootings, according to this article...
https://www.personaldefensenetwork.c...out-gunfights/
Not as much as many people would lead us to believe. We frequently hear claims like: “Check out the stats, man, it’s always at 20 feet or less, and nearly always at 10 feet or less.” Or “that zero to three feet distance that most gunfights take place at in the real world.” Various figures are cited as the source for these contentions, most commonly “the FBI.”
Well, neither of those statements can be proven true based on the information supplied by “the FBI.” The available facts are actually a lot less conclusive than many people portray them as. Consequently, there is a great deal of unsupportable extrapolation of the facts that do exist.
The data that is being referred to is compiled and published as part of the FBI’s annual Law Enforcement Officers Killed & Assaulted report, which is available to download from the FBI’s website. It is published around the end of October each year for incidents occurring the previous year.
Since LEOKA 2012 has just been released, let’s examine the assertions about them. Unfortunately, the FBI does not gather information about distance of gunfights in routine submissions to the Uniform Crime Reporting (UCR) Program. The only information on distances is gathered as supplemental data in cases where police officers are actually killed. These data are compiled in Table 36 — Distance Between Victim Officer and Offender, 2003–2012, in the current report. However, this table reports only a very small subset (44) of “gunfights” police engaged in. The data that is collected about the total number of police gunfights (2,259) is compiled in Table 70 — Type of Weapon and Percent Injured, 2003–2012. No distances are provided in this table.
Image from FBI.gov
Image from FBI.gov
Even the data in Table 36 must be interpreted carefully, because the distance given is for where the officer was actually killed. For example, in a previous year, a State Trooper returning home was ambushed from across the street at a distance of 35 yards with a rifle and severely wounded. His assailant then walked over to him and executed the Trooper at close range with a handgun. Since the Trooper was killed at almost touching distance, he was reported as a zero to five feet casualty. But the “fight” actually took place at 35 yards.