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Doc:
5.56x45mm (.223 Remington) Ball ammunition (M855 or M193) will do that if it is moving over 2700 fps and may do it if it is over 2500 fps. As the wound was allegedly self-inflicted, this is likely.
As the projo enters tissue and goes through its first yaw cycle, the stress on the jacket causes it to fracture at the cannelure and break up into many small lead and copper particles each creating its own wound track.
I can provide more technical details if you wish, but the injury and description of the particles is consistent with a close range shot from a 5.56mm FMJ or Ball round.
HTH.
TR
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De Oppresso Liber 01/20/2025
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