I used my AI app to get information about Dr. Vincent Di Maio's work in regards to the fragmentation of full metal jacket (FMJ) bullets. Here is the result:
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Vincent Di Maio on Fragmentation of Full Metal Jacket Ammo in Skull Penetration
Vincent J. M. Di Maio, a renowned forensic pathologist and expert on gunshot wounds, has written extensively on the ballistic behavior of full metal jacket (FMJ) bullets and their interaction with bone, including the skull. In his authoritative work Gunshot Wounds: Practical Aspects of Firearms, Ballistics, and Forensic Techniques, Di Maio explains that FMJ bullets are designed to maintain their jacket integrity during flight, but when they encounter bone, the jacket can fragment due to the high pressures and stresses involved.
How FMJ Bullets Fragment in Bone
When an FMJ bullet strikes bone, especially dense bone like the skull, the jacket can deform and break apart. This fragmentation is a result of:
High pressure and velocity from the bullet’s flight.
Bone resistance causing localized stress concentrations.
Jacket material properties — the copper or gilding metal jacket can fracture under impact, especially if the bullet is not perfectly round or if there are imperfections in the jacket layer.
Di Maio notes that fragmentation in bone is more common with FMJ than with pure lead bullets, because the jacket is more rigid and less ductile, making it more prone to cracking under the compressive and shear forces of bone contact ia800508.us.archive.org.
Forensic Pathology Context
In forensic examinations, the pattern of fragmentation can be important for:
Determining the caliber and type of bullet.
Assessing the trajectory and impact point.
Understanding the mechanism of injury in bone and soft tissue.
For skull penetration, fragmentation can lead to multiple entry wounds or bone chips being propelled into surrounding tissue, which can complicate the wound pattern and the pathologist’s reconstruction of the event.
Key Takeaway
According to Di Maio’s forensic ballistics principles, FMJ bullets can fragment in bone, including the skull, due to the combination of high-velocity impact and the rigidity of the jacket. This fragmentation is a documented phenomenon in forensic pathology and can be observed in autopsy findings, though it is not always the primary cause of injury — the bullet’s core and the bone’s reaction are equally important in determining the wound’s characteristics.
If you need a visual or technical reference, Di Maio’s Gunshot Wounds book and his other forensic pathology publications provide detailed diagrams and case-based explanations of bullet fragmentation in bone.
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In my previous post, I suggested Di Maio might not have much direct experience with FMJ rifle gunshots to the head. However, since he did write a book about gunshot wounds, it seems probable to me he would have looked at case studies beyond his own experience and would have larger knowledge base than what he acquired through his own work as a forensic medical examiner.
MTG has made several claims about Di Maio's work which I am quite skeptical about. For one, MTG claims Di Maio changed his mind about his earlier work which accepted Oswald was the lone assassin. We only have MTG's word for this since he doesn't actually quote Di Maio rejecting his earlier belief. He goes on to claim that Di Maio said that FMJ bullets would never shatter the way that the bullet that struck JFK's head did. This gets back to a question I raised in my earlier post. Was Di Maio speaking about FMJ rifle ammo or pistol ammo. Due to the vast difference in velocity, this is an important factor. Given MTG's practice of citing people out of context, I am highly skeptical of his claims about Di Maio's conclusions. I will give MTG the opportunity to clarify his claims by answering two simple questions.
1. Can MTG QUOTE Di Maio actually saying that he had abandoned his earlier position that Oswald was the lone assassin?
2. Can MTG provide context that would tell us Di Maio said FMJ rifle ammo would not fragment as shown in the JFK x-rays or was Di Maio speaking specifically of handgun ammo when he made that observation.
I suspect MTG has been giving us his own interpretation of what Di Maio has said on the subject but will be glad to drop my skepticism if he can provide quotes from Di Maio that specifically address the question of Oswald as the lone assassin and that he was speaking specifically of rifle ammo when he made his observations on how a FMJ bullet would fragment after striking a skull.