9mm vs. .40 S&W: A Comparison

Headstamp-to-Headstamp is our series aimed at helping you grok everything ammo.

The debate over the most effective handgun caliber is as old as time itself. In this article, we will compare two of the most popular calibers available today – the 9mm to the .40 S&W.

By Michael Crites

Michael Crites is el jefe around here. He has spent more than 30 years shooting, learning about guns, and collecting firearms old and new. He holds his Oregon Concealed Handgun License, and enjoys testing products in the back 40 of his farm.

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