To add more confusion...
(Or maybe just add to Hollywood's contributions to authenticity)

In the movie, Sgt York used a 1903 and also picked off several Germans with a Luger.

I've read that 'Sgt York' used a Luger in movie version, only because they had a Luger set up that would cycle consistently firing blanks. From what I read (long ago) was they had a M1911 that was supposed to be used in the movie but it didn't function consistently firing blanks, so they used the Luger they had on set that happened to function better.

(Only what I read!)