Jeff Cooper wrote an excellent section on handgun shooting in the Outdoor Life hardcover book "COMPLETE BOOK OF SHOOTING", published in 1965.
He covers a lot of things in the span of 130 pages, much of it things you wouldn't expect from him, i.e: formal target shooting, small game hunting, and a good overview of arms and cartridges.
The photos in the book show both a 6.5" and 8.375" Smith and Wesson .44 Magnum, the latter with custom thumb rest target stocks. I've included only the long one here.
The last picture shows his one shot group (?) at 100 yds. It's dated "19 Aug '63". So, he had this long barrel .44 at least that early.
I've attached a few pertinent images, plus one fun picture.
You can plainly see a five screw 44 Magnum with the long 8.375" barrel. Holding the book in my hands, the front sight pins are even clearly evident.
One of the strangest entries concerns big game hunting in the continents of the world. He says this about Africa:
"Skipping the giants and the traditional, I'll choose the gorilla. You'll need a museum permit to take him, but such can be had. If you threaten his group he will charge, and a charging gorilla is a fearful spectacle. To stand your ground with a handgun and flatten him at 15 feet is man's work."
So, there ya go.
The info on shooting techniques are still quite informative. In fact, the whole chapter beats most of the internet info-babble you read today.
Oh yeah, the rifle chapters are written by Jack O'Connor and Roy Dunlap...excellent reading!
Jim