[quote=@Dynamo Frokane]
[@shagranoz] I think there were revolvers.
[/quote]

Nope. Colt invented the revolver in 1836, 2 years after this setting. For multiple shots you'd still be using multiple pistols, or a double-barreled pistol.
The closest thing to derringers would be the Toby or "Muff" pistol, essentially a miniaturized flintlock meant to be concealed in a coat or purse.