I have an Uberti 1851 Colt that I bought about 5 years ago and shoot only about 18-20 grains of black powder in it fearing metal stretch.
That is a very light load, in fact that is a brass frame load. As long as you have a good arbor and wedge fit you well never wear it out shooting those loads. The Italian steel is at least equal to the originals. There is a problem on some revolvers with soft parts, hands, triggers, even hammers. It's more with the older revolvers, newer ones seem to be good to go.
Pietta's quality has really improved in the past few years, as good as any Uberti I have handled. Lately I have seen more Uberti's that need work than Pietta's.
Like coyotejoe said, reaming chambers for barrel fit goes a long ways in increasing accuracy.
The open top Colts need to have the arbor bottomed in the barrel lug with a .006-.008 barrel gap. The hammer should be a few thousandth off the nipples so you don't get any peening. You do that and you'll have a good running revolver.
Would I be better off with the 3rd model dragoon versus the 1860 Army for strength? I used to have a Pietta 1860 army and it was a hoot to shoot, the dragoons that I have handled at the gun shows are really heavy, but I have never owned one.
Normal loads for the Dragoon is 35-40grs, just slightly less than the Walker. Lighter and shorter than the Walker they are fun to shot and have much more energy that the 60 Army. Handle a Walker for a few hours, then Dragoon well feel small.