So what do you all think, I would have to have seen it to believe it. That bullet couldn't have been going much over 700fps, wind drift, bullet drop, width of the front sight. That is allot of stuff to overcome.
Then what you're saying is you don't believe Elmer Keith's shooting ability. Fine. I'd suggest getting a copy of
"Hell, I Was There" - read it, then get back to us on whether you now believe what Elmer did.
He was the real deal. A Montana / Idaho cowboy who grew up shooting all types of rifles and pistols, shot at the Camp Perry rifle matches, was instrumental in developing the .44 magnum, and is generally considered the dean of shooting / hunting / gun writers.
I would suggest going to the Cabelas in Boise, ID to see the Keith museum if you have the chance.
There is no reason to not believe Elmer Keith made the 600 yard shot with a pistol given his shooting ability, and daily association with guns and shooting as part of his life. He describes the shot in detail in his autobiography.
A 700 yard shot he made with a pistol is described on page 124 of
Hell, I Was There. The shot was done for Harold Croft who came from Philadelphia to witness the shot.
The target was a 4-foot square made from some boards at Elmer's ranch.
Keith laid down on his back using his saddle for a headrest, and held the gun between his knees to steady it. He had practiced the shot on numerous occasions for his own information on long range shooting. On his first try, it had taken him 11 shots to get the correct elevation for that range. Once he had the range figured out, he proceeded to put six shots into the target.
Unless YOU can offer proof to contrary, other than rank skepticism based upon your shooting abilities (which won't be in the same universe as Elmer's) - let it go.