... That quote is worth repeating, and note that Dr. DiMaio says that even in cases where an FMJ bullet perforates bone only rarely will the missile leave fragments, and that even then the fragments will be "few":
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In x-rays of through-and-through gunshot wounds, the presence of small fragments of metal along the wound track virtually rules out full metal-jacketed ammunition.. . . In rare instances, involving full metal-jacketed centerfire rifle bullets, a few small, dust-like fragments of lead may be seen on x-ray if the bullet perforates bone. One of the most characteristic x-rays and one that will indicate the type of weapon and ammunition used is that seen from centerfire rifles firing hunting ammunition. In such a case, one will see a "lead snowstorm". . . . Such a picture rules out full metal-jacketed rifle ammunition or a shotgun slug. (Gunshot Wounds, CRC Press, Boca Raton, 1999, p. 318, emphasis added)