A professional who tends machines that load small arms cartridge cases with powder and bullets and crimps cases, working as member of team. Responsibilities include:

• Places powder dispensing plate in machine fixture and pushes lever that moves plate under machine hopper to fill holes in plate with powder and return it automatically.
• Clamps plate of cartridge cases over powder plate and turns over assembly to dump powder into cases.
• Taps dispensing plate with mallet to dislodge powder residue and removes plate.
• Measures powder-filled cases, using special gauge, to verify cases are filled.
• Positions plate of bullets over plate of cartridge cases and pulls bottom slide in bullet plate to drop bullets into cases.
• Positions cartridge plate on press and pushes lever to lower punches that seat bullets to specified depth in cartridge cases.
• Places plate of cartridges on press bed and pushes lever to lower crimping block that crimps cartridge cases around bullets.
• Removes plate from press and examines cartridges for defects, such as dented points, scratches, and loose bullets.
• Measures samples with fixed gauges to verify conformance to specifications.
• May be designated according to machine unit tended as crimping loading-unit operator; powder charging loading-unit operator; seating loading-unit operator.