I know several USMC snipers that could and would prove you wrong.
Yeah, I've heard this one before too. Doesn't make it humanly possible, though. Physics, you're claiming, anecdotaly, thirdhand, that physics is wrong, and the impossible is possible. There's too many variables In Every Shot. You're talking about USMC Scout-Snipers, with tens of kills under their belt, who've never had the target move, never had someone walk into the path of the bullet, never had any of the atmospheric layers between the muzzle and the target change, and never had a weird bone deflection because they're shooting at organs, they can't see, from hundreds of meters away, and ALWAYS get a kill, because they're just so damned good that nothing. Ever went wrong?
Bullshit. Flat out bullshit. People aren't a collection of hit points, or machines with on/off switches. Sniper rifles aren't magic wands, and in the real world chaos is the only constant. Nobody's prefect. Nobody never makes a mistake, and if you play the odds long enough, luck eventually runs out.
Not to mention the fact that 80% of the USMC Scout-Sniper schools aren't even shooting. (I trained at one of those schools, Quantico Marine Base. I used to live on Longboat key, with a Scout/Sniper as a roommate.) They're getting in, and out alive, because their training is more costly than Any target, and failure is always a possibility. You're talking about a myth, from a movie poster.