A professional who sets up automatic machines to fill head cavity of rim-fire cartridge cases with explosive priming mixture. Responsibilities include:

• Installs and aligns knockout pins, primer-spreading punches, and shell-holding blocks, using handtools and gauges.
• Sets stops and cams to synchronize movements of feeding screws and rolls, shell-holding fingers, and ejection mechanism.
• Starts machine and examines primed cartridge cases for defects, such as dents, scratches, or unfilled head cavities.
• Cleans priming mixture from tools and machine bed, using air blast or vacuum hose.
• Dismantles machine to replace worn or broken parts.