If you were to have a replica 1866 and want the proper period correct revolver to go with that rifle, the proper revolvers would be:

Colt 1871-1872 conversion on the 1860 .44 frame
Remington 1858 conversion
S&W No 3
Those were the revolvers that were chambered in .44 Henry back in the day. Many would later be converted to .44 Colt centerfire.