I am fairly sure it is a Taurus "The Judge". It is a 410/45 long colt. The long shells are most likely 410 slugs and the couple I saw the military use had brass shotgun casing. I saw the movie a copule of times long ago and I didn't know what it was either. I really don't know of any other pistol like it and I've been around firearms for well over 35 years.