The following weapons were used in the film Seraphim Falls:
Carver (Liam Neeson) carries an iron frame Henry 1860 rifle in the beginning of the film. The iron frame is what the first 400 Henry rifles were produced with (brass was added in late 1862 as production picked up).
Colt 1849 Pocket
Madame Louise (Anjelica Huston) sells Carver a Colt 1849 Pocket model with a Confederate-style brass frame. In the film it is a cartridge converted firearm, as evidenced by the lack of percussion nipples in the fourth photo below.
Smith & Wesson Schofield
Carver is seen taking a Colt 1851 Navy off a railman when he's threatened by the foreman. Three clues point towards it being a percussion model and not a cartridge conversion: the loading lever is still attached (not a guarantee, but a good sign), you can just make out the indentation on the cylinder for the nipple (the big clue), and brass framed Navys never were/are/should-be converted to fire metallic cartridges.
The Colt 1851 Navy with a Richards-Mason cartridge conversion is seen in the hands of Parsons (Ed Lauter) as well as Charon (Wes Studi). Carver also is seen taking one off a railman when he's threatened by the foreman.
Springfield 1873 Trapdoor Carbine
Double Barreled Percussion Shotgun
A Double Barreled Percussion shotgun is seen in the hands of a young woman (Shannon Zeller) as well as the railway foreman McKenzy (Xander Berkeley).