There are so many factors which configure into a 'One Shot Stop'.
No modern policeman would likely fire one shot anyway, they tend to fire all the arm holds or a lot more than 'one' anyway.
I do not think it is meaninghful to try and co-relate one-shot-stops to any specific Cartridge/Calibre.
What the Bullet hits, is far more the matter, where, anything hitting the Spine or Brain fairly hard, will make for a one shot stop, and, anything not doing so, likely will not, or, not instantly anyway.
Some people wil drop instantly even if receiving a very superficial wound, and, others will continue to aggress even if parts of their skull are blown off and their heart perforated, for however long it is untill their Blood Pressure drops past where the Motor Cortex can still still manage, and, this can be a few minutes even.
If the recipient of a Bullet manages to muddle on well for four minutes after being shot through the Heart, to then collapse, is that a 'One Shot Stop'?
Maybe it is...
There was a guy in the news also a while back, who died of complications incidental to a Bullet wound received in the Texas Tower Sniper incident, which wound had not dropped him at the time, but did cause him decades of problems.
Granted, this would represent an instance of some considerable delay, but, it that a 'One Shot Stop'?
Maybe it is...
There was that story in the news awhile back, of a woman, whom the Police found sitting on a couch, looking a little woosey, who had a small hole in her forehead, and, she had been shot from very close range with a .44 Magnum, and, the Bullet passed through her entire head, between the Cerebral Hemispheres, and went through the wall behind her, and, did not even knock her out, let alone kill her.
What the Handgun Bullet of any Calibre actually perforates or impacts in the recipient, in my imagining on these things, is the central and salient factor as for the probable effects it would have upon the recipient, with Cartridge type or Calibre, secondary.
