I reload 45 Cowboy Special (45CS) using the LEE .455 Webley Mark II three die set P/N-90764 and a .45 colt shellplate/shellholder.
The sizing die is labeled .45 Colt. The other two dies in the set have Webley markings.
I did add a .45 LEE Factory Crimp Die (FCD) P/N-90865 in the mix as a 4th station crimp only die. I set the Webley seat/crimp die to seat only.
Makes for a sweet 4 die setup. I like seating and crimping separate. You can do three dies but I like 4... it's a round number.. lol.
So it looks like:
Die 1 - .45 Colt sizer / decapper die (part of the
Webley three die set)
Die 2 - .455 Webley Powder thru expander die (part of the
Webley three die set)
Die 3 - .455 Webley seat /crimp die (set to
seat only, part of the
Webley three die set)
Die 4 - Optional -.45 Colt/Webley/Casull
FCD (with the carbide ring removed, for
crimp only. It's just how I am. I like bullets with big hips
Die 4 notes: You could also do die 4 and leave the ring in, or contact LEE and order another Webley seat/crimp die and use it to crimp only. You could grab an old 45 colt seat/crimp die, toss the seat stem, then shorten (cut/grind/machine) the die body so the crimp portion of the die can contact the neck on the shorter 45CS brass... or say the heck with it, ditch the separate seatin' an' crimpin' idea and rock it old school and just use die 3 to seat AND crimp. That method has worked for decades.. lol. Your choice. I'm no judge..45 Colt shellplate/shellholder
Shouldn't be too cost prohibitive to grab a 3 die set.
Example:
https://www.titanreloading.com/455-webley-markii-3-die-set-carbideIf going for that 4th die then:
https://www.titanreloading.com/lee-precision-reloading-equipment/lee-pistol-reloading-dies/lee-pistol-factory-crimp-dies/45-colt455-web454-casull-carbide-crimp-die-If that didn't make sense let me know and I'll try to correct my verbage here or explain it better in another post?
Anyway it's pretty much how I run it on my Dillon with a Pro Auto Disk. (is that blasphemy? Red and Blue working together for the greater good.. lol) Now that Brass is available and I can go back to loading it in volume I may reinstall the Dillon hopper.
I hope this helps someone.
Good luck.
Case dimensions:
https://en.wikipedia.org/wiki/.455_Webleyhttps://en.wikipedia.org/wiki/.45_Colthttps://en.wikipedia.org/wiki/.45_ACPI almost forgot, ya might notice that in my reloading setup the dies that would affect case dimensions are .45 colt dies. The Webley'ist portion of the setup is adjusted to only to expand, fill, and seat. So outer 45CS case diameter remains as Colt from neck to base as the colt dies allow.