The North Australian Inc. Handcannon is a single-shoot, breech-loaded pistol which fires the 25x163mm anti-air round used by the WW2 era Japanese Type 96. Its action can... probably resist the pressure, seeing as it's almost wholly bluemetal, titanium and tungsten alloy. On the other hand, the shooter's meaty hand has far greater concerns than if the action can hold through, primarily its integrity.