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Everybody Ive ever known uses the term "dud" for a round that doesnt fire at all, whether its a cartridge or a firecracker, and "squib"for a load without gunpowder. Now for a history lesson. A "squib" is the ignitor that was used to fire a cannon in the old days, made of a thin tube, filled with gunpowder and sealed on the ends with wax. When a cannon was fired without gunpowder or without enough (probably because someone wasnt paying attention) using only the squib the projectile wouldnt fire out of the barrel, it was referred to as a "squib" load. Hmmm, sounds familiar, now what does that remind you of?