9mm vs. .40 S&W vs. .45 ACP: Which Should You Choose?

Summary

This article provides a comprehensive comparison of the three most popular handgun cartridges: 9mm, .40 S&W, and .45 ACP, for self-defense. It delves into their historical context, terminal ballistics principles, including the FBI's testing protocols and the Miami shootout, and debunks the myth of 'knockdown power.' The article specifically details the .45 ACP's history, typical ballistics, and its reputation for effectiveness.