Actually, there wasn't a different "caliber" for the 1866. The 1866 was only ever manufactured in .44 There was however, the slightly
different "cartridge." That cartridge being the .44 Henry Central Fire. Those guns, the last 1866s produced were not retailed in this
country. They all went to South America. If one were "Vacationing" in that part of the world, it would be a hoot to locate some
shootable examples of the Central Fire 1866 and bring them back. Be a pain to get em past the BATFE but perhaps thru an import
license holder?? Oh well.
Prior the the entry of Uberti onto the replica scene, there are no known examples of either an 1866 or an 1860 being built with an
extended frame to permit the inclusion of the 44-40. At the time the 44-40 was introduced, the 1860 Henry was already in Dodo
status and the 1866 was already slated for Dodo. The 1873 was entering the market place and selling like hot cakes. Continuing
the 1866 was not financially a good idea for Winchester.
Coffinmaker