Metallic Cartridge Chamber Pressure MeasurementWhen the gun is fired the copper pellet is crushed (deformed) by the pressure to . for metallic cartridges is taken by the copper crusher method of measurement.copper crusher deformation,Copper units of pressure - WikipediaCopper units of pressure or CUP, and the related lead units of pressure or LUP, are terms . A chamber pressure measured with a copper crusher gauge would be expressed as psi (CUP) in the . The amount of deformation is compared to the amount of crushing produced by different pressures in pounds per square inch.
copper crusher deformation