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A cartridge conversion sleeve may include a short barrel of reduced bore diameter. Shotgun conversion sleeves may be called subgauge inserts , subgauge tubes , or gauge reducers . Sleeves intended for rifle or handgun cartridges may have rifled barrels.
Caliber conversions Rechambering or rebarreling for a new caliber, such as conversions made to chamber a wildcat cartridge; Use of a caliber conversion sleeve or other readily removable insert to fire a smaller, less expensive cartridge; Operating mechanism conversions
The caliber conversion sleeves resemble fired cartridge cases in the rifle calibers for which they are made, but are made of steel instead of brass, and have an opening where the primer would normally sit into which the 32 ACP cartridge is inserted, prior to chambering the combined 32 ACP round and caliber conversion sleeve in the rifle.
This may be accomplished by replacing the (often plastic) barrel of the flare gun with a metal pipe strong enough to chamber a shotgun shell, or by inserting a smaller-bore barrel into the existing barrel (such as with a caliber conversion sleeve) to chamber a firearm cartridge, such as a .22 Long Rifle. [22] [23]
P.O. Ackley was a notable gunsmith famous for developing wildcat cartridges from parent cartridges like the 30-06 Springfield. For many of the wildcats listed above, and several of standardized commercial chamberings based on the 30-06 cartridge, there are "Ackley Improved" versions with sharper shoulders increasing case capacity. [25]
The .38 Short Colt, also known as .38 SC, is a heeled bullet cartridge intended for metallic cartridge conversions of the cap and ball Colt 1851 Navy Revolver from the American Civil War era. [ 1 ] Later, this cartridge was fitted with a 0.358-inch (9.1 mm) diameter inside-lubricated bullet in the 125–135 grains (8.1–8.7 g) range.