I would try sizing your C45S brass in a .45 ACP sizing die if you haven't already.

So, I just received my 45 ACP Cylinder and did the minor fitting required for my Uberti Dalton, 45 Colt.
The Cylinder is from Taylor's & Co. and works just fine in my Uberti. I originally purchased the 45 ACP Cylinder
to shoot C45S Rounds through it, as I have read about a few people shooting C45S Rounds through their
45 ACP Cylinders.

I found that I can drop 6, 45 ACP Brass Cases in the 45 ACP Cylinder and my Uberti cycles and operates
just fine. If I try and load C45S Brass I find that it gets tighter as I push it further into the Cylinder. I found
that this is due to the Cylinder having a slight taper in it to coincide with the taper on the 45 ACP Brass.

So my plan now is to use my 45 ACP Cylinder to test sub 14,000 C.U.P. rounds and then use that data to
load C45S Cases and fire them in my 45 Colt Cylinder. This must seem like a bunch of trouble to go through
to shoot something, but I guess that's just me.

Hmm, maybe I should invent "Texas screws".

The smooth part would be shaped like a (Lone) Star, which would be easier to both tighten and loosen. 

Thanks Slim,
 I'm thinking you may need to switch to Swee'Tea for the next week or so, Temps here in the upstate region of the peoples republic of newtorkistan have been high 80' low 90's

Thoughtful stuff:
Great photo.
Smiles,
El Supremo/Kevin Tinny