The 1986 Miami Shootout: The Gunfight That Changed Law Enforcement Nationwide - Guns News and Guns Reviews at Guns.com This single incident brought about many positive changes in the shooting world in general and in law enforcement in particular. It directly led to the development of bonded handgun ammunition as well as a change in firearms training away from moving to the next threat after a double tap to keep shooting until the threat has been stopped. It also led to the development of the .40 S&W and indirectly to the .357 Sig. Many LE agencies began drifting away from the revolver towards semi-automatic pistols chambered in .40 S&W which opened the door for the .45 ACP and more recently in .357 Sig. While many agencies issue a standard caliber, many authorize their officers to purchase and carry their own pistols in other calibers. Although the Columbine Shooting saw more LE agencies purchasing, training and issuing patrol rifles to their officers, this incident proved how effective the .223 with mushrooming ammunition was in a gunfight.