A professional who tends battery of automatic machines that perform any combination of following operations to assemble shotgun shells preparatory to loading with powder and shot. Responsibilities include:

• Starts machine that coils paper strip into wad and presses wad into shell body; presses molded base wad into shell body; presses metal head onto body and crimps head to form extractor flange; or presses loaded primer into head.
• Observes machines for jams in hoppers and feed mechanisms and removes jammed components.
• Examines assembled shells for defects, such as open seams, wad bulges, damaged mouths, and malformed or tarnished heads.
• Measures head thickness and diameter, shell length, and primer depth, using fixed gauges and dial micrometer.
• Weighs coiled paper base wads on grain scale to verify conformance to specifications.
• May fill hoppers with components and remove filled containers of assembled shells and rejects.