Are you aware that JFK was "SEVERELY WOUNDED" ....Do you actually believe the bullet that blew half his head away was a FMJ projectile???
That?s because he was shot in the brain.
The non-severe woundings bit refers to bullets maintaining structural integrity through other parts of the body, usually the torso, which end of leaving focal, less serious and more easily treatable wounds than the explosive, diffuse and sometimes inoperable destruction left by hollow points.
The best you can hope for after being shot in the brain is not having too drastic behavioural or personality changes.