.22 ILARCO

The .22 Winchester Short Magnum Rimfire, also called .22 ILARCO,[2] was a rimfire cartridge designed for the American-180 rimfire submachinegun. 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 Winchester Short Magnum
.22 Short Magnum compared to .22 WMR
TypeRimfire
Place of originUnited States
Production history
Designed1987[1]
ManufacturerWinchester
Specifications
Parent case.22 WMR
Bullet diameter.224 in (5.7 mm)
Neck diameter.242 in (6.1 mm)
Base diameter.242 in (6.1 mm)
Rim diameter.294 in (7.5 mm)
Rim thickness.050 in (1.3 mm)
Case length.669 in (17.0 mm)
Overall length0.950 in (24.1 mm)
Primer typeRimfire

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 magnum short. The new cartridge was designed so that a simple change of barrel was all that was required required to switch between standard .22 long rifle, for which the gun was designed, and the new cartridge.

Dimensions and loading

The .22 Short Mangnum uses a shorter version of the .22 WMR case with the same 40 grain projectile as the original .22 WMR loading.


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See also

References
  1. "Rimfire Small Arms Rounds". Retrieved 26 July 2020.
  2. "THE CARTRIDGE COLLECTOR". Retrieved 26 July 2020.
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