speed loader

noun2

1. •
   A pressed metal (or plastic) clip, holding a set number of cartridges for a firearm, and used for rapid reloading of the weapon or its magazine.

   • With a speed loader, a practiced user can dump and reload their revolver's cylinder surprisingly fast — even, in some cases, no slower than someone can swap magazines in a semiauto.
2. •
   (old-fashioned) A software technique for loading programs (e.g. from cassette tape) more quickly than normally possible.