Howdy.  I don't know    .

But, the distance from the barrel shoulder to the back of the threads is a LOT longer on the '58, so you would definitely be cutting off some of the threads and adding a new forcing cone.  Getting your ejector housing to properly fit might be an issue as well, since those are designed/shaped to go on a round barrel.

I would be curious if Uberti and Pietta happen to use the same threads on their SAA repros, then you could use a Pietta octagon barrel and ejector housing like are on the Cimarron El Malo's (but sourcing those might be a problem).  Good luck.

I'm thinking this is not for CAS, but fyi a dovetailed front sight ('58) is not SASS-legal on a SAA-style gun, not sure about NCOWS but probably not.

Maybe just save what you would have spent on the parts and gunsmith work (unless you do it yourself) and put it toward an El Malo. 

I want an octagonal barrel. Yes I know it's not HC/PC, Colt never did it etc.  My Uberti isn't a museum piece and I like the look, and it's my gun......
I have about worn out my keyboard and my fingers searching for some information, but no luck.
Would anyone know the LENGTH of the barrel shank on an Uberti 1858, and the same measurement on the Cattleman? The diameter and TPI of both would also be helpful, as some websites disagree. If anyone has either one or the other, I would greatly appreciate it.  Thank you.

Looks great, I can just barely see some plum on yours.
 My slide release is just a bit turning plum.

As to time on these, well actual hours? maybe 8, but weeks in elapse time.
I had to go up to my old work 20 to use the bandsaw to split the 5/4 Amer. holly board and rough out. Then the planer to size (thickness)
then my belt sander at home and finally hand sanding.

I made the Rosewood grips from two scales I got from woodcraft.com,
https://www.woodcraft.com/products/woodcraft-woodshop-bolivian-rosewood-knife-scales-3-8-x-1-1-2-x-5-pair
They were my first attempt, and I finished them a little too thick for my hand.
I made the Holly's a bit thinner.

I posted a video of Whiskey Kid shooting BP in a Wild Bunch match in the Birdcage Theatre forum:
https://www.cascity.com/forumhall/index.php?topic=69572.0

oops nevermind I found those files elsewhere on cascity

Whiskey Kid shooting BP in the Wild Bunch side match at Comancheria Days 2025 with the Texican Rangers.  I believe he's shooting APP in the rifle, not sure about shotgun, but real BP in the pistol.  He said the 1911 runs fine but he cleans the chamber periodically.

Excellent job, sir! Those look fantastic, and I bet they feel good, too. I have fit a few grips here and there, but making them is way above my pay grade. How long did it take you?  Mine has ebay grips that I love, but I did not make them!  The reason I'm posting this picture is for the frame. I'd had the nickled gun for a good while, but 5 years ago added the polished blue version.  The metallurgy of the frame is obviously different than yours because it has turned Plum. Pretty quickly, too, after just a couple years.  I had some good pics of the plum that I lost, here is one I just took but it is hard to get the lighting right so that it shows like it does in person.  I actually kind of like it.  I have a Colt SAA NRA Centennial Commemorative whose grip frame is plum.  I've heard that is common on those guns.

Thank you, Mike 

I got Graham, Kopec and Moore's "Study of the Colt Single Action Army", along with Moore's follow up "New Discoveries" and "US Alterations"  All fine reading and worth the money.

   Holy Guacamole 

Roger, that combination is just absolutely STUNNING!!  STUNNING I tell ya.  Your 1911 would have looked good.  Real Good with the Rosewood Grips.  Oh yes.  The Rosewood grips are/were really "Nice."  Real nice.  As opposed to the way it looks now.  STUNNING.  Stunning is the only work I find applicable (you have a security system?? ).  Or a really big DOG??

Nope.  I also like STUPENDOUS!!  Oh WOWZERS!!  Yum Yum just isn't ENOUGH.

HUGE BIG LIKE.  bigger than big LIKE BUTTON!!