10mm auto vs .40 S&W: The Brother War | The Dead Calibers Archive

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Dive into the epic 10mm Auto vs .40 S&W battle from history to modern day.

We begin with origins – the 10mm Auto was introduced in 1983, and after the FBI’s notorious 1986 Miami shootout (which exposed the limits of ammo at the time), Smith & Wesson/Winchester developed the shorter .40 S&W round in 1990 to meet the FBI's performance expectations. However, there's much more to this story and we dive into some of the earliest 10mm/.40 Caliber pistol cartridge experiments and how we ended up with the 10mm Auto and the .40 S&W we know today.

Topics covered:

○ History & Origins: 10mm Auto’s birth (Jeff Cooper’s design, Bren Ten, 1983) and the FBI’s hunt for more firepower leading to the .40 S&W (debut 1990) after Miami.

○ Iconic 10mm Pistols: A look at classic and modern handguns chambered in 10mm (Colt Delta Elite 1911, Glock 20, S&W Model 1076, and the iconic Bren Ten).

○ Performance: Ballistic comparison of 10mm vs .40 S&W – muzzle energy and velocity.

○ Modern Relevance: Why some shooters are rediscovering 10mm for hunting and self-defense, while law enforcement embraced – and eventually moved away from – the .40 S&W.

○ Mythbusting: Is 10mm Auto really the hand cannon round that you think it is? Or does .40 S&W have some practical advantages that made the FBI choose it over the 10mm Auto?

Read the companion article with full links to additional resources here -

https://www.capandballseo.com/dead-calibers/handgun-calibers/10mm-auto/

For more in-depth ammo history and analysis, check out the Dead Calibers Archive at Cap & Ball SEO: https://www.capandballseo.com/dead-calibers/.