.22 ILARCO
The.22 ILARCO / 5.7x24mmRF, also known as the.22 Winchester American Magnum Special,.22 Winchester Short Magnum Rimfire, or.22 American, was a rimfire cartridge designed in 1987 for the American-180 rimfire submachine gun. At the time the cartridge was created, the design of the American-180 had been taken over by the Illinois Arms Company, Inc., hence the ILARCO name.
.22 ILARCO
Wikimedia Commons · Public domain
- Name
- .22 Winchester Short Magnum
- Field
- rimfire cartridge
VALÉORINE Encyclopedia
VALÉORINE documentary reading
Documentary summary
The.22 ILARCO / 5.7x24mmRF, also known as the.22 Winchester American Magnum Special,.22 Winchester Short Magnum Rimfire, or.22 American, was a rimfire cartridge designed in 1987 for the American-180 rimfire submachine gun. At the time the cartridge was created, the design of the American-180 had been taken over by the Illinois Arms Company, Inc., hence the ILARCO name.
Admitted source layer · organised and presented by VALÉORINE
Reference Check
Propose documentary evidence for .22 ILARCO. A contribution is never written directly as fact: identity, source, rights and evidence gates still decide.
Sign in to contribute
World of VALÉORINE
Documentary connections
Only confirmed graph relationships appear here. Images are shown only when their identity and reuse rights both pass the documentary gate.
Documentary evidence
Documentary basis
Authority files
wikidata · Q97738272 · wikipedia · .22 ILARCO
In this article
Key facts
Key facts
• Name —.22 Winchester Short Magnum • Origin — United States • Type — Rifle • Design Date — 1987 • Manufacturer — Winchester • Parent —.22 WMR • Case Type — Rimmed, straight • Bullet —.224 • Neck —.242 • Base —.242 • Rim Dia —.294 • Rim Thick —.050 • Case Length —.669 • Length —.950 • Primer — Rimfire • Max Pressure — 24000 • Bw1 — 40 • Btype1 — FMJ • Vel1 — 1350 • En1 — 160
History
History
Sometime after the Illinois Arms Company, Inc. (ILARCO) purchased the rights to the American-180 they determined a more powerful cartridge would be appropriate, which resulted in the creation of the.22 ILARCO. The new cartridge was designed so that a simple change of barrel was all that was required to switch between standard.22 Long Rifle, for which the gun was designed, and the new cartridge.
Dimensions and loading
Dimensions and loading
The.22 ILARCO uses a shorter version of the.22 Winchester Magnum Rimfire case, which use the same 40 gr projectile as the original.22 Winchester Magnum Rimfire cartridge.
Citations
References
Each reference names the institution holding it, so a reader may go to the document itself.
reference work
Secondary witnessreference work
Secondary witness
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 17 August 2026.
Elsewhere in Militaria
6,095 published records in this field, each with its sources named.
- .22 CreedmoorTerminology
- .22 Eargesplitten LoudenboomerTerminology
- .22 extra longTerminology
- .22 HornetTerminology
- .22 LongTerminology
- .22 long rifleTerminology
- .22 Remington AutomaticTerminology
- .22 Remington JetTerminology
Best supported in this field
For owners
Own an object connected with .22 ILARCO?
A specialist will read what you send and tell you what the house can establish, what it cannot, and whether the object is suited to sale. There is no charge and no obligation. The object stays with you throughout; nothing is shipped to us unless it is arranged in writing beforehand.