dragoon

Can anyone tell me what the original nipple thread and pitch on the original Walkers and Dragoons were/are? I'm trying to locate some #12 nipples for my ASM Walker and Uberti 2nd Model Dragoon. I ordered some from Lodgewood Mfg that are supposed to be copies from the originals. They were1/4" but...

I measured cylinder chambers of 2nd Gen Colt 2nd Dragoon. Used a cheap hole gauge and a caliper. Oval chambers: 0.442" X 0.448". Each chamber, axis measured on a line running from center of chamber to center of arbor hole, 0.442". Measured perpendicular to line above, 0.448". Does it make...