Rodwha, if you are addressing me, I have not measured chambers or the barrels on any of them or the twist rates. None of mine are new at this point. The kit Navy gun was assembled by me back in the late 1970s. It has been shot many times and is still tight, but shows a slight amount of gas erosion on the top of the cylinder pin. The Euroarms was purchased with several other pistols second hand and is very clean and tight. I had been shot, but probably not a bunch. The Pietta Sheriffs model was just purchased from a local pawn shot. It was in bad shape when I got it. It had been neglected and the cylinder was rusted to the cylinder pin and had some rust in the barrel. Price paid was about what one would pay for a cylinder. Luckily the pin was easy to free up and the barrel cleaned up with only a few light pits left.
I've shot the first two with the Navy being shot the most. I'm more a plinker, so haven't benched any of them to see how accurate they are. I'm not a very good off hand pistol shooter, so can't tell much from plinking.
I think at this point I like the Euroarms the best. It just has a nice feel to it. I feels the most graceful in the hand. I do like the short handling of the short barreled Pietta and need to get to the range with it. If I do, I'll shoot it from bags to see what the accuracy might be given my aging eyes.