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In page Cartridge (firearms):

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Many governments and companies continue to develop caseless ammunition[citation needed] (where the entire case assembly is either consumed when the round fires or whatever remains is ejected with the bullet). So far, none has been successful enough to reach the civilian market and gain commercial success. Even within the military market, use is limited. Around 1848, Sharps introduced a rifle and paper cartridge (containing everything but the primer) system. When new, these guns had significant gas leaks at the chamber end, and with use these leaks progressively worsened. This problem plagues caseless cartridges and gun systems to this day.