I read about it once. I didn't find it that impressive. Didn't see any reason to memorize it.
"Nice shot. Not many could have done it."
Now what? Like you said... wouldn't recomend it, wouldn't suggest any one try it... so now, what use is the incident?
I hit a pop can stuck on a weed from one hundred yards once with the first shot from a bow and arrow. So what? I put the bow away and it was the one and only shot I took with it that day. Doesn't mean diddly.
I don't really see what you are getting at, it's impossible for a 44 mag rifle to ever be a 300 yard gun in any configuration or variety of reload IN MY HANDS, but some how 44 mag hand gun in some one named Elmer Keith was like a magic wand at 600 yards? I'm no magician, I don't think Elmer Keith was either. That's all I'm saying.
The money is spent, the bullets are laying there useless other wise, I'm going to see what I can make them do, I wondered if any one else here had already "invented that wheel". That's really about all it's about on my end. If Elmer made his 600 yard shot with Hornady 265 grain pointed bullets I'd be more interested.