By the way guys, as for the 45ACP versions of the guns being "Bubba'd", I believe that you're off the mark. As per what I've been reading, their cylinders were actually factory cut (or shaved) at Webley to accept 45ACP/45 AutoRim prior to being exported to the States, as the .455 Webley cartridge was unavailable in America. So, the guns have a different history, but are not the result of some basement operation by Bubba. There is a value difference though, as the unaltered versions (from Britain) bring a premium on the collectors' market. For shooting however, the modified ones are much more reloader-friendly (for obvious reasons) and will perform just the same as the unaltered ones. When used with moon-clips (available on eBay.ca), they are also much faster to reload than unaltered versions.
As for reloading dies, I find that a set of 455 Webley dies from Lee is a perfect all around die set for loading everything Webley (and then some). I use mine to load for my 45ACP/AR MkI Webley, for 45 Schofield and of course for 455 Webley (which the dies were designed for). I am pretty positive that my 45ACP ammo would fit & shoot well in any 1911 also. The added benefit of 455 dies is that they're slightly larger than standard 45ACP ones, therefore will preserve your brass longer when used in a Webley (thanks to lesser amounts of stretching during resizing of the brass). That is particularily important with 45AR brass, which today is both scarce and expensive.
That said, enjoy your Webleys! They are certainly very unique and well made revolvers.
P.S. These loads are much too hot for a Webley and can cause the revolver to blow up or the frame to stretch. Do not use them! The safe amount of powder (range) for a Webley would be somewhere in between 4.5 to 5.5 of Unique, not more
(as pressure has to be kept under 12,000 psi in these according to info available). Remember that you're not dealing with a modern S&W revolver here.