I might mention that there have been just a few advances in metallurgy since 1873.
As an example, old barrels were always dead-soft. You would have no rifling left, should you put half a box of .44 Maggies through an original barrel.
Same with the actions. How many rounds of .44 Mag would it take to damage a cast-BRASS action? Sure, the 73 Winchester used an Iron action..... but that was just plain old IRON. I highly doubt that a reputable company such as Uberti will be using old-fashioned Bessemer Iron in this day and age, if they even could get the stuff. Yet that is what the old-time rifles were made from and THAT is the reason for all those fancy case-hardening colours when they were new. Today, colour-hardening is for decorative purposes; back then, it was the difference between a rifle which fell part after 1000 rounds and one that lasted a century or so with Black Powder ammo.
.