DROPPED PRIMER

One that is separated completely from the cartridge or shotshell after firing without obvious distortion of the primer pocket and head.

DRY FIRE

The practice of “firing” a firearm without the use of live ammunition.

DUMDUM BULLET

An obsolete term referring to an expanding bullet manufactured at the British Arsenal in Dumdum, India around 1900.

DUMMY CARTRIDGE

An inert cartridge which cannot be fired under any circumstances. In America, an inert cartridge for gun functioning is usually black oxidized and may or may not have holes in the side wall of the case. An inert cartridge for display may be natural colored and should have a hole in the primer cup with holes in the side wall of the case optional.

DUPLEX LOAD

1. A cartridge case containing two projectiles with a single powder charge. 2. A cartridge case containing a single projectile with two types of powder.

DUST COVER

1). A cover over the ejection port of a firearm to reduce the possibility of the entrance of foreign matter into the action. 2). The forward part of a pistol frame which protects the recoil spring.

DUST SHOT

Lead shot having a nominal diameter of .040” or smaller.

DRAM EQUIVALENT

See “What does “dram equivalent” mean on shotgun ammunition (saami.org/faqs/#dram-equivalent-ammunition)

DOLL’S HEAD

A usually round extension at the top of the barrel or rib of a shotgun which fits into a matching hole in the top of the standing breech.