Judging by where I see the case headspace in the chamber, I'd check .45 ACP in that. I don't think it's actually 38 or 44 wcf.

Yes, generally you understand that clones are built to the Colt SAA blueprint. There are some deviations in machine cuts and measurements that do make a difference on whether you can swap parts.

In Uberti / USFA world, the cylinder width is 1.675 +/- a hair. These cylinders will not fit in Colt SAA cylinder windows.

In Great Western / ASM / Pietta world, cylinder width is 1.655 +/- a hair. These are swappable into Colt's provided you get good timing off the hand, ratchet, and cylinder bolt.

Can you put a Colt cylinder in a Uberti? Maybe, but you wouldn't want to, not really. You'd want to get better fit than that. Uberti cylinder is actually stronger (in theory) such that its wider. Might make a difference on the margins for things like .45 Colt, though conventional wisdom is you don't shoot warm .45 Colt in SAA.

 

Thanks for all that info. Just tried ..45acp, it drops in as well. The cylinder bores are cut for a rimmed cartridge, so I assumed it was a rimmed cartridge cylinder.

 

Primitive Arms with a Branson rollmark is a 1990 era Uberti.

 

I don't know if Colt ever made such a thing, but the ratchets look like 3rd generation Colt. If 45 acp firs PERHAPS the counterbore is so a .45 auto rim would also fit.

 

Looks like a 3rd gen cylinder with removable bushing. That counterbore isn’t anything I’ve seen on a Colt ACP cylinder and I’ve had a few. Pete

 

I bought a bunch of "junk" at auction, and did pretty well finding some good stuff therein - a Lyman 2A, a Lyman 103 Windguage, a WWII era USMC KABAR, and a few other odds and ends.

Now, at the bottom of the box was a revolver cylinder - completely without any marking whatsoever. A cursory examination revealed that it was for a single action revolver of some description, but I put it aside to pursue other projects. I took it out to examine it in more detail yesterday..... indeed no markings to be found. I trial fitted some rounds in it, 45 Colt was too long, 44 mag and 44 Spl were a no-go, but 38-40 and 44-40 fit very nicely. Curiosity piqued, I pulled out my SAA clones in 44-40, a Cimarron Uberti and a "Primitive Arms".

Well what do you know - that (empty!) cylinder fit both, and timed correctly when the action was worked. So I'm wondering, it this a cylinder for a Colt SAA, or other manufacturer's clone? Are the reproductions built to Colt spec? Does anyone have a clue as to what I have here?

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I have never seen a 1st gen cylinder countersunk to allow some of the head thickness to lay inside.