Calling the shot is knowing where the bullet went before it gets there. A, D, Miss, No Shoot, whatever. Doesn't matter......all it is is knowing exactly where it went the instead it left the barrel.
I guarantee that there is no one in the world that knows exactly where every round that leaves their barrel goes. If you are off by an inch...guess what...you didn't call the shot. I'm not saying it is impossible...but it would require a focus on this world that I don't think yet exists.