Determining the Number of Test Fires Needed to Represent the Variability Present within 9 mm Luger Firearms

Firearm examiners are often asked to determine whether or not a cartridge case recovered at a crime scene had been fired by a firearm found in possession of a suspect. Comparisons are performed by comparing the impressions left on the cartridge cases by use of a comparison microscope, allowing for the similarities and differences to be noted. Finally, conclusions are made based on the opinion of the examiner, taking into account observations and automated database results if performed. For the purposes of this study, only the breech face and firing pin impressions will be compared.

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