http://www.abaris.net/info/ballistics/handgun-stopping-power.htm "380 ACP - The top rounds in this category were the Federal 90 grain Hydra-Shok and the CorBon 90 grain JHP+P which both rated a 70% one shot stop rating. While Federal 90 grain FMJ ammo was used in a whopping 245 shootings, it only achieved 55% one shot stops." 45 ACP - This caliber has been around for almost 100 years and is still the top rated round. More police agencies are using this round due to its proven stopping ability. The large diameter, heavy bullet is the basis for the "momentum" theory of stopping power however actual results in shootings show a mix of "light and fast" and "slow and heavy" rounds. The Remington 185 grain Golden Saber was involved in 148 shootings and caused 142 one shot stops for a 96% rating followed closely by the Federal 230 grain Hydra-Shok which caused 200 one shot stops in 211 shootings for a 95% rating. Eight of the 16 loadings examined rated above 90% one shot stops while 5 others rated in the 80s. The poorest stoppers were the Remington, Federal and Winchester 230 grain FMJ rounds which achieved 62% one shot stops.