Know Your Cartridge: .357 SIG


.357 SIG.This cartridge is based upon the .40 S&W case, simply necked down with a short neck and a sharp shoulder. The design purpose was to achieve .357 Magnum revolver ballistics from typical semi-automatic pistols. This cartridge design offers several potential advantages.

First, its compact nature allows use of a smaller (shorter) grip frame in pistols so chambered. Second, compared to the parent cartridge, the .357 SIG can effectively launch lighter bullets at greater velocity to achieve similar muzzle energy with less recoil. The .357 SIG is loaded to a comparatively high pressure level—the same as top factory .357 Magnum loads and 14 percent higher than the .40 S&W or the 9mm Luger.

The combination of high pressure, reasonable case capacity, and no barrel venting (as seen in .357 Magnum revolvers) allows this petite cartridge to generate significant ballistics—fully the equal of the .40 S&W in terms of muzzle energy. However, in the typical short pistol barrels used, there is a price to pay for this level of performance—muzzle blast is significant.

SIG .357 Table.

This cartridge spotlight is an excerpt from:

Cartridges of the World, 14th EditionCartridges of the World, 14th Edition
This edition has been expanded by 120 pages, and features 50 new cartridges that range from industry leader factory loads, to wildcat ammo and more. This must-have cartridge guide includes coverage of the most recent introductions in commercial cartridges and shells, brand-new authoritative articles on in-depth cartridge design and performance topics, expert advice on handloads and shooting from prominent industry experts, updated data charts, specifications and references, and much more.  Learn more

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