I've bumped this thread for anyone who is genuinely interested in when the first shot actually happened.
It is based on the presumption that there were three, clearly audible shots fired [as confirmed by over 160 "ear-witnesses"] and that these shots were fired from the Sniper's Nest on the 6th floor of the TSBD building.
As far as I'm aware, every single piece of evidence regarding this aspect of the case has been considered and it overwhelmingly demonstrates that the first shot occurred around z222 and that both JFK and Connally were shot through by the same bullet.
Note - I do not accept the Single Bullet Theory because I do not accept that CE399 was the bullet that passed through both men. However, once it is accepted that a bullet passed through JFK's neck with hardly any resistance it must be accepted that this bullet hit Connally. It could not miss Connally!
It's my personal opinion that this bullet shattered when it struck Connally's wrist.
And, just for full disclosure, I do not believe Oswald took the shots, although this has no bearing on the subject of this thread - when the first shot actually took place.
Many theories have been put forward for when this first shot occurred and all are refuted by the evidence presented in this thread. All except for a first shot around z222.