pendulum gun

noun

Definition of pendulum gun 

: a mechanism for obtaining certain ballistic data for given shotshell loadings that consists of a tube fitted with a breech and a firing mechanism and moving freely on its four supporting wires and that by means of attached and coordinated instruments determines velocity, time required for shot charge to pass through barrel, chamber pressure, energy of recoil, and shot pattern

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History and Etymology for pendulum gun

so called from its motion when fired

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