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Jan 9, 2018 at 15:56 comment added Thucydides Electric primers are your friend. And it may be possible to have some form of chemical propellant which burns underwater, so the cartridge does not have to "isolate" the propellant, leaving the pressure equalized in an unfired cartridge case. In this instance the case serves to carry the proper amount of propellant and allow for ease of storage and use.
Jan 9, 2018 at 14:46 history answered JerryTheC CC BY-SA 3.0