Frangible Ammo explodes on impact into tiny fragments like the bullet that struck JFK's skull.
It's totally plausible that second or third shooter would use that type of ammo over the type of ammo that could be ballistically matched to a specific rifle.
What is Frangible Ammo:
Frangible the characteristic of breaking into tiny fragments is a bullet that doesn't deform or expand like a hollow point, but instead shatters or disintegrates upon impact with the target. This target is anything harder than the bullet itself, which is usually made of composite materials that are pressed together with adhesives or formed under high pressure into a "solid" bullet shape. Frangible bullets are sometimes known as Advanced Energy Transfer rounds, or AETs, and the Glaser Safety Slug is by far the most recognizable name.
https://ammo.com/bullet-type/frangible
Thank You for posting the link, Mr Banks.....
You can find frangible ammo in quite a few varieties, available for both pistols and rifles. However,
youre more likely to find the pistol ammo due to the frangible rifle round's performance inconsistencies from firing at such high velocity including fragmenting early, jamming in the rifle or other issues.
I've long believed that the round that struck John's head was a 45 caliber ( subsonic ) frangible bullet.....and it was fired from a 45 caliber weapon that was equipped with a silencer.