Clint looks to have big hands/very long fingers. In the second colour photo where he is sighting through the scope on the MS his hand and fingers, especially the trigger finger look quite cramped holding the pistol grip and he is holding his little pinky clear of the grip, it looks very long. Maybe it is just the slim MS grip that is accentuating this?

I understand in real life (not as Dirty Harry) he is competent with the 44 Magnum. He does look to have hands suited to the big revolver?