I knew Keith a little,and I saw him shoot at 200 yards, with a .44 Magnum revolver. He was then well into his 70's and his eyesight wasn't what it had been. But his marksmanship wowed a number of spectators, including a TV reporter, to whom I had to explain who Elmer Keith was and that a powerful handgun can indeed astound the average person, in capable hands.
Briefly, I think HE believed he'd killed that deer. It was already wounded, inc. by Keith who opened fire at about 250 yards, as I recall. It had also been shot with a .300 H&H Magnum rifle.
I think it may have fallen just as he fired the 600 yard shot, dying of earlier wounds. That led Elmer to think he'd fired the lethal shot.
I'd like to get further into this, but don't have time.So, I'll say this: I saw how his fellow gun writers treated Elmer at the SHOT show and an NRA Convention, including a press breakfast where I sat next to him at his request.
To a man, we all respected him and believed that he was probably telling the truth in his books and articles. A number of us had seen him shoot. Many of us had done some long range handgun shooting and knew what was possible. You can't fool associates like that group. A BS artist is soon detected by his literary peers.
I read Askins' article, "Elmer's Little Mortar" about that long shot. But Charlie told me himself that he often wrote controversial stories, to generate reader mail, to let his editors know he was being read. I think Askins could come close to what Keith did at long range with a handgun. Recall, he had been National Pistol Champion and head of the USBP marksmanship program.
I went home soon after I had breakfast with Elmer, that same day, and I knew he was suffering from a respiratory infection. I called Col. Askins' home in San Antonio, as I knew he lived in that city, where we were, for the NRA Convention. (I'm from Dallas. I had to leave to file my stories about the Convention and new products, with two editors.) And I knew that he and Elmer were friends. Mrs. Askins told me that Elmer had been diagnosed with pneumonia and that Charlie was with him at the hospital. I don't think Askins would have been as good a friend to Keith as they'd been for decades, had Askins not respected and believed Keith.
I think that speaks well for Keith. Bear that in mind as you read other posts here.