That's interesting. I don't have a Pietta and have never handled an original but it doesn't 'seem' larger than it should be. I typically prefer more svelte Colt-style single actions so it'd be worth looking into if there is a noticeable difference.
The new `58 cartridge conversion from Cimarron also piques my interest.
What I also find interesting are the 1875 and 1890 replicas from Hartford Armory. They are supposedly identical to the originals in size and heft but yet are strong enough to handle .44Mag and .45Colt pressures. I'll be damned if they don't call `em "Remmies". :barf:
http://www.hartfordarmory.com/remmies.htm