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.357 SIG

pistol cartridge designed by SIG Sauer and Federal Premium Ammunition

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionSep 23, 2026
Entity authorityQ158755 ↗
Source-derived summary

The .357 SIG (designated as the 357 Sig by the SAAMI and 357 SIG by the C.I.P. or 9×22 mm in official metric notation) is a bottlenecked rimless centerfire handgun cartridge developed by the Swiss-German firearms manufacturer SIG Sauer, in cooperation with ammunition manufacturer Federal Premium. The cartridge is used by a number of law enforcement agencies.

History

The .357 SIG is based on a necked-down 10mm Auto case, forgoing the large pistol primer utilized by the 10mm Auto in favor of the small pistol primer used in many common self-defense rounds, such as .40 S&W, .38 Special, 9 mm and other similarly-sized cartridges. Excluding specialized wildcat cartridges used in competition shooting — e.g., the 9×25mm Dillon, which necked a 10mm Auto case down to a 9 mm bullet — the .357 SIG was the first modern bottlenecked handgun cartridge to become commercially available since the 1961 introduction of Winchester's now-obsolete .256 Winchester Magnum, a .257 caliber round based on the .357 Magnum. Later the same year Remington and Smith & Wesson began jointly developing a similar round and, before the year's end, introduced the .22 Remington Jet, a .357 Magnum case necked down to accommodate a .22 caliber bullet.

Despite its favorable ballistics and performance, the .357 SIG has not achieved the widespread adoption seen with similar cartridges. One factor preventing the round from achieving greater popularity could be the cost of the ammunition, which frequently reaches double the expense of 9 mm, .40 S&W or .45 ACP ammunition. Because of this, as well as availability issues, some law enforcement agencies that previously adopted the cartridge have reportedly began to move away from the .357 SIG in favor of more common rounds with comparable performance.

Cartridge dimensions

The .357 SIG has 1.27 ml (19.5 grains H2O) cartridge case capacity.

Several sources have published contradicting information regarding .357 SIG headspacing.

Editorial summary

This brief starts where responsible research should: with the source description of “.357 SIG” as pistol cartridge designed by SIG Sauer and Federal Premium Ammunition. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—1961—that can be checked directly. The selected authority fields contribute no independent date. The account is most persuasive where pistol, cartridge and designed can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as pistol cartridge designed by SIG Sauer and Federal Premium Ammunition. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 23, 2026. The linked authority identifier is Q158755. The first chronological checks are 1961.

Critical limits

Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “.357 SIG”, its source revision and the description used here.
  2. Expand the search: follow .357 SIG primary sources, .357 SIG archive and pistol research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “.357 SIG”?
  2. What terminology or title could unlock a more precise catalogue search?
  3. Which cited source is closest to the event, object or claim?
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Source & attribution

This entry incorporates text from “.357 SIG” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.