Some research:
Item “1B-28” - 20 mysterious shrapnel pellets of “unknown origin”
Apart from the single page mentioned above, only one other forensic laboratory report out of those missing hundreds has ever been released by the FBI. It was an analysis performed by Brookhaven National Lab (BNL) to evaluate 20 small (~1/4” diameter) pellets that were removed during autopsy of the person whose ME# was 96-5037; the pellets were designated Item “1B-28”. The lab report showed that a sample pellet was composed mostly of Aluminum with traces of Titanium, Zirconium, Cerium and Barium. Such compounds are consistent with incendiary pellets used in some missiles. The report merely concluded "unknown origin." The details of 1B-28 were among over 200 fairly innocuous pages of documents released in response to a Freedom of Information Act request from another independent researcher, Don Collins, in California. The FBI’s executive summary of that BNL Lab report was at variance with the remarkable implications of the BNL’s findings. The FBI initially classified the BNL report "secret."
Even if the remarkable incendiary components could be explained, the official low-velocity type fuel explosion could not shatter aluminum into small pellets.
Refer to the details and some of the documents of this BNL evidence at:
http://www.flight800.org/FBI_COMP.htm
http://www.twa800.com
Great. Now all we have to do is find a suitable candidate to provide the type of fragmentation you describe.
Tungsten fragmentation?
Ok.
Titanium fragmentation?
Ok.
Aluminum alloy fragmentation?
Back to you.