Caliber Conversion Sleeve - Uses

Uses

In addition to often being less expensive than the larger cartridge, the smaller cartridges offer much reduced recoil and muzzle blast. They are useful for short range target practice or killing small pests. With shotguns, the smaller shot load carried by a smaller shell increases the challenge of hitting targets, and therefore can be used as a handicap for a skilled shooter, or to increase difficulty when training.

Some European conversions exist for special gallery cartridges, similar in concept to the .22 CB rounds, which use a primer but no gunpowder. These adapters were chambered for centerfire versions of these tiny rounds, such as the 4mm 4mm Übungsmunition cartridge. Gallery cartridges such as these were intended for use in indoor target practice, and are similar in power and report to an airgun.

An episode of the television series Columbo featured a "calibration converter," as it was called in the show. The killer had a large handgun collection in his office but none of them matched the caliber of the bullet he used to kill the victim and Columbo had to figure out what happened to the gun the killer used to commit the crime.