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Job Description:

  • 1) Measures propellant force of powder charge by firing small arms cartridges and shotshells in pressure-testing device: Selects test barrel according to type and caliber of cartridge to be fired.

  • 2) Secures breech end of barrel in fixture containing breech-block, hammer, and firing pin, using handtools and gauges.

  • 3) Inserts gas check and steel piston into vent in barrel wall.

  • 4) Positions lead or copper slug of standard length on piston and tightens yoke-mounted setscrew which acts as anvil to secure it.

  • 5) Fires cartridge and measures compressed slug for reduction in length, using micrometer.

  • 6) Converts reduction in slug length to pressure expressed in pounds-per-square inch, using conversion chart.

  • 7) Computes average pressure for specified number of cartridges.

  • 8) May perform velocity tests on projectiles.




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End Of Job Description for: "PRESSURE-TEST OPERATOR"
DOT:   737.387-018

Job Number: 7862