1 - I didn't large blood splatter, I said "bleeding" and even "a fountain of blood", which means you have spend zero time watching people get shot in the head (which is an awful way to spend your free time, but in your case an indispensable task).
2 - You are asking a lot from an subsonic round. Even under ideal conditions it's not going to have enough energy to do the damage you allege. A supersonic, high-gain-twist Carcano round on the other hand...
3- The Carcano round struck Kennedy in the back and exited the throat, and struck Connally. The Carcano round was notorious for multiple penetrations.
Your lack of knowledge of ballistics is dwarfed by your lack of knowledge of forensics.
The allegation that the medical evidence was tampered with and falsified is a lie, proven years ago to be a lie. The fact that you choose to believe a lie handicaps everything that you think you're doing. You are seeing things that aren't there because you have made the choice to trust liars.
You are no different than a Bigfooter, UFOlofist, or garden variety dime-store psychic.