Handloading or reloading is the process of loading firearm cartridges or shotgun shells by assembling the individual components (case/hull, primer, powder, and bullet/shot), rather than purchasing completely assembled, factory-loaded cartridges. Boxer-primed cases are more commonly (see Centerfire ammunition) 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 cases and shotgun hulls using new bullets, shot, primers, and powder. In modern usage, some make no distinction between these terms, while others find important distinctions. One key distinction is the purpose for the practice; handloaders often seek smaller batches of high-quality ammunition, whereas reloaders are said to make large quantities of ammunition that does not need to be of as high quality but at least one authority (McPherson) holds that a better distinction for these connotations is that, regardless of quantity, handloads tend to be of generally high quality while reloads tend to be merely functional.
Read more about Handloading: Reasons For Handloading, Equipment, Materials Required, Reloading Process, Legal Aspects, Atypical Handloading, Accuracy Considerations, Cost Considerations, Bullets