Those are all crazy shots.
Re: #4 Shooting through a wall
That was using a .50 round with a ring of RDX embedded in it for that extra “kick” in the fragmentation effect.
The Sniper movie with Tom Berenger was based on the “shot” by Carlos Hathcock. But here’s an excellent comment in the comments section:
POST: Mythbusters tried the scope shot and declared it busted, I’m probably the 600th person to say so.
REPLY: Mythbusters didn’t go to Marine boot camp and do two tours in Vietnam.