it wasn't available to purchase when the Clint Eastwood-starring crime-thriller romanticized the .44 Magnum. So, there's an argument to be made that Dirty Harry's revolver was the most powerful ...

The landmark movie gave Clint Eastwood his most famous role ... While Harry's famous Smith & Wesson Model 29 revolver holds .44 Magnum bullets, blanks of that caliber were unavailable in 1971.