Blanks have a primer and powder charge. In place of a lead bullet, the casing is crimped over some wading. When chambered and fired, they go BANG!
Dummy rounds have no primer, no powder charge but do have a lead bullet. Dummies often have a BB inside that you can hear rattle when shaken. Some dummy rounds may have a hole drilled through the casing while some may have fluting of the casing
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