Handloading or reloading is the process of loading firearm cartridges or shotgun shells by assembling the individual components (case/shotshell, primer, powder, and bullet/shot), rather than purchasing completely-assembled, factory-loaded cartridges. Generally only Boxer-primed cases (see internal ballistics) are reloaded.
Historically, handloading referred to the private manufacture of cartridges and shells using all newly-manufactured components, whereas reloading referred to the private manufacture of cartridges and shells using previously-fired cartridge brass and shells with new bullets, shot, primers, and powder. In modern usage, however, no distinction is made in these terms, and they are considered synonymous.
