The meaning of an accessory projectile.

A previously expended pistol casing was removed from a gunshot wound after an apparent accidental shooting. Examination of this foreign body indicated it had ridden the bore ahead of the bullet. Further investigation disclosed this as a deliberate but ignorant means to load an already loaded weapon. The assailants then fired at a passerby and killed him. Disclosure of the foreign body by X-ray, recovery and examination at autopsy were used to corroborate the circumstances and allowed charges of criminally negligent homicide to be placed.

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[3]  J Timperman,et al.  Tandem Bullet in the Head in a Case of Suicide , 1975, Medicine, science, and the law.