In a time long ago I was a range rat and saw all kinds of .44 revolvers fired with every type of load. I've seen small liquor store owners knocked over backwards, and come up laughing. I've seen CHP speed load six into the target. But they carried the .357.
Factors include porting of course, the other usual physics and the competence of the shooter.
There's nothing to suggest Clint knew his stuff, of course Inspector Callahan did. But its all fantasy. Harry is legend to me and to my buds from the shooting fraternity in the City in the 60's- 70's.
"My, that's a big one".
Other good model subjects from our fair City include "Bullitt";
Pistol: 2 1/2 inch barrel Colt Diamondback
Car: Mustang GT-390
Figure: Jackie Bissett in his Brooks Bros. buttondown.