Sealed round

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A sealed round is a munition which is typically stored in some kind of container (usually a cylinder or box, but the container may in fact be the outside of the munition), so that the munition does not require any sort of maintenance and is stored in this container until use. The advantage of this type of system is that such munitions can be stored for long periods without needing to be periodically checked and possibly repaired. Typically these, like all munitions, still do have a shelf life—but it is often quite long. Bullets have been sealed rounds ever since the cartridge case was invented.