Compositional Variation in Bullet Lead Manufacture

    Volume 47, Issue 5 (September 2002)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Published Online: 1 September 2002

    Page Count: 9


    Grant, DM
    Forensic examiner, Chemistry Unit, FBI Laboratory, Washington, DC.

    Koons, RD
    Research chemist, Forensic Science Research Unit, FBI Laboratory, FBI Academy, Quantico, VA

    (Received 10 April 2002; accepted 7 April 2002)

    Abstract

    The concentrations of antimony, copper, tin, arsenic, silver, bismuth, and cadmium in lead alloys produced by two smelters and one ammunition manufacturer were determined using inductively coupled plasma-atomic emission spectrometry. These element concentrations were used to measure the variations in composition of lead products that result from various processes involved in the manufacture of lead projectiles. In general, when a pot containing molten lead is used to cast a number of objects, these objects are similar, although not necessarily analytically indistinguishable in their elemental compositions. In each subsequent step in the processing of lead at the smelter and at the ammunition manufacturer, the size of an individual homogeneous melt of lead decreases as more distinct compositions are formed as a result of remelting and mixing of sources, including lead scrap. The ammunition manufacturer in this study produced at least 10 compositionally distinguishable groups of bullet wire in a 19.7-h period. The largest group could potentially be used to produce a maximum of 1.3 million compositionally indistinguishable 40 grain bullets.


    Paper ID: JFS15516J

    DOI: 10.1520/JFS15516J

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    Author
    Title Compositional Variation in Bullet Lead Manufacture
    Symposium , 0000-00-00
    Committee E30