Also known as reloading
thumb|Components of a modern bottleneck rifle [[cartridge. Top-to-bottom: Copper-jacketed bullet, smokeless powder granules, rimless brass case, Boxer primer.]] thumb|Hole|Slotted [[trays or "loading blocks" that hold empty cases awaiting handloading and completed cartridges (top right area)]] Handloading is the practice of making firearm cartridges by manually assembling the individual components (metallic/polymer case, primer, propellant and projectile), rather than purchasing mass-produced, factory-loaded commercial ammunition. Handloading using previously fired cartridge cases or shotshell