Well if you are saying it was a one time thing, then yes it could have happened. I have made a couple of shots in my lifetime which were pretty much unbelievable.
Now if you are saying you did it because you are so good, then no it is not a reasonable statement.
I’m a very good shooter, but at those ranges, there’s quite the element of luck involved heh. When one shoots their rifles as much as I do, you get to be very familiar with the equipment, so that helps. You’re correct though, there’s a definite element of the “hail mary” pass going on heh.