Obturation
The gas-sealing function of the cartridge case during firing, in which the case wall expands outward under propellant pressure to seal the chamber and prevent rearward escape of combustion gas past the case body.
The gas-sealing function of the cartridge case during firing, in which the case wall expands outward under propellant pressure to seal the chamber and prevent rearward escape of combustion gas past the case body.
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