A buckshot round for use in large, smooth-barreled weapons, such as an M203 or M79 grenade launcher, wherein the round itself acts as the firing barrel. The substrate side contact portion is configured to be brought into contact with a cable device. The filter assembly comprises a filter panel including a bristle filter and a frame that holds the bristle filter, the bristle filter including a plurality of bristles. A female connector 17 is formed from terminal fittings 20 and a female housing 18, the terminal fittings 20 having resilient contacts 20b capable of resiliently making contact with the bus bars B when the connector 12 is fitted into the connector 17.