A report from a Brit paper said it was a cap and ball, which would be correct for the period.
It isn’t as easy to see if one of the cylinders in a cap and ball is loaded with a ball. I’d have to look at one of my replicas to see if the end of the cylinder is covered or not.
On cap and ball, many people grease the chamber to seal it. You’ll only see black powder lube at the front of the cylinder, and not the bullet under it.
“A report from a Brit paper said it was a cap and ball, which would be correct for the period.”
According to IMDb, the movie was set in the 1880’s.