Stopping Power
Many organizations, agencies and even individuals have developed theories to rate the effectiveness of defensive handgun ammunition. Most of the results, though they seem definitive in nature, are contradictory. Here’s a brief snapshot of more than 100 years of speculation.
“If you don’t think you have time to aim, I doubt you have time to miss.” In 1904, U.S. Army Captain John Thompson and Major Louis LaGarde shot live steers and dead humans to determine which cartridges were most effective. Julian Hatcher, a former Technical Editor at American Rifleman, based his theory of Relative Stopping Power on this study, concluding the .45 ACP twice as effective as a 9mm. In 1975, the National Institute of Justice finalized what they called the Relative Incapacitation Index, which was later updated…