I like that movie.
Finally a few years ago, I bought an 1873 Winchester rifle (octagon barrel, curved butt, full magazine) in .44-40 and after a careful cleaning and inspection took it to the range.
After loading up, I carefully adjusted my hearing protectors and I fired.
"Ptap".
Not "Bang", not "pow", and certainly not a thunderous roar - just "Ptap".
It turns out that a pistol cartridge in a long gun doesn't isn't loud at all.
Thus I learned of the insidious effects of movie magic and their sound men. A little bit of a letdown!