I am quite enamored with my own 1873 Winchester in 44/40 WCF. None of the calibers the '73 has been chambered in were wonder cartridges in the modern scheme of things, but my '73 has harvested more deer during its service life than the rest of my war toys put together. My great-grandfather bought it and gave it to my paternal grandfather, and it was handed down to me. It was made in 1897, so it has a steel receiver. Its accuracy is modest; it runs SAECO #446 into 1.5" at 50 yards and about 3.5" at 100.
I have seen and handled several of the Uberti repro '73 examples at a pawn shop in town that is a Uberti stocking dealer. The Italians build some beautiful things, no doubt about it. Some of these repros have been chambered in 357 and 44 Magnum; I have seen the knee-action lockworks behind my carbine's sideplates.......HARD NO to those calibers, even after the 1990 pressure moderation they received from SAAMI.
Lastly, the biggest upgrade made in 44/40 and 32/20 calibers is to its cartridge casings--by Starline. W-W and R-P brass will tweak and destroy itself inside a die if stared at intently; the Starline brass is sterner stuff.