I didn't realize Kennedy was under water when shot.
People, FMJ ammo is designed to remain as intact as possible
BINGO !https://www.history-matters.com/archive/jfk/wc/wcvols/wh2/html/WC_Vol2_0191b.htm
Mr. SPECTER - And could it have been the bullet which inflicted the wound on Governor Connally's right wrist? Colonel FINCK - ]No; for the reason that there are too many fragments described in that wrist.
Unfortunately many of the loons and kooks have gotten their impression of how a trial would have played out from the 1992 fantasy book by Walt Brown "The People Vs. Lee Harvey Oswald".
@NewbiesFMJ ammo is designed to resist damage while passing through flesh.