High Quality Content by WIKIPEDIA articles! A speedloader is a device used for loading a firearm or firearm magazine that will run out of ammunition very quickly. Generally, speedloaders are used for loading all chambers of a revolver simultaneously, although speedloaders (of different designs) are also used for the loading of fixed tubular magazines of shotguns and rifles, or (with other designs) the loading of box or drum magazines. Revolver speedloaders are used for revolvers having either swing-out cylinders or top-break cylinders. Non-top-break cylinder revolvers having fixed cylinders must be unloaded and loaded one chamber at a time.