From what I could make out reading the article. I believe it is chambered for the 244 Remington, or better known now days as the 6mm Remington. Just a tough more powerful than a 243. This cartridge came out in I believe 1955. So it was a pretty new round at the time this story was written, "1965".
That would have been a very unique handgun at the time.
Edited by Bob Roach (12/23/17 08:02 AM)
See You At The Range