I have Uberti rifles, 1860 Henry, 1873 Carbine, and 1876 Carbine.
All mine are .45 Colt or .45/60 for the 1876
Between the 1860 and 1866 you must decide two things, do you want a Kings side loading gate with a wood forearm protected barrel, the big differences between the 1860 and the 1866 and a game changer as far as the development of lever action rifles is concerned.
Plus will you be satisfied with a bronze frame gun that will not stand up to very heavy shooting verses a steel frame rifle.
Uberti only offers the 1866 with a bronze frame. Chapparal Firearms offers the 1866 with a steel/iron frame though the overall quality of their guns can be spotty at best.
Uberti does offer the 1860 as a bronze frame or a steel frame rifle.
I have had three 1860s over the years and now own a steel frame gun.
It will certainly stand up to heavy use such as Cowboy Action Shooting, I know because I have used it for such but all the things mentioned in above posts are true.
Exposed follower tab slot in bottom of magazine allows all kinds of junk to get in there and it can tie up the magazine and even get into the guts of the rifle causing problems there.
There is no dust cover up top either and all kinds of stuff can get into the action from that angle too.
Removing the sideplates regularly for cleaning the action inside is a gimme with these guns.
Ubertis are well fitted and easy to remove and replace, a plus to them.
The follower tab can hang up on your hand as you lever cartridges in unless you remember to move your hand with five to six shots remaining as you work the lever.
Don't do this and the gun will short cycle and not pick up and feed a round into the chamber.
The Barrel gets HOT in rapid fire.
Plinking at the range not so big a deal, lever off fifteen rounds fast and the barrel gets hot enough you won't be able to grasp it with a bare hand, it requires the use of a "Michael Jackson Glove" and you will likely burn yourself when you grasp the muzzle area to open the magazine for loading.
Accuracy wise, I think you will get better results from the steel frame guns just because the barrel mounting area is more rigid than can be achieved with bronze.
Neither of my bronze frame guns shot as well as any of my steel frame guns.
Bronze frame guns will wear quicker with these heavier calibers and get out of time and/or develop headspace issues.
I takes A LOT of shooting to do so with the steel frame guns.
If you are prepared to deal with the little issues, the Henry 1860 is a great gun to play around with, I love shooting mine.
Would it be my first choice as a combat arm today? No, absolutely not, but as a plinker/hunting rifle they are pretty excellent and unique among forearm offerings today.
Ammo choices; I am not going to get into the .44/40 and .45 Colt debate suffice to say I have owned both and stick with the Colt cartridge now.
I would personally like Uberti to produce the 1860 and 1866 in .44 Russian caliber which for all practical puposes a centerfire duplicate of the original .44 Henry rimfire round without the pesky rimfire and heel mounted bullet.
Someday they may actually take my suggestion seriously and when they do, I will buy one of their Henry rifles and one of their 1866s in this caliber. Bronze frames of course!
I always get folks who want to admire and fire off a few rounds when I bring it out!