My recollection is Lee sells an inexpensive Webly die set which worked fine for me. Seem to remember the sizer in the Lee set is the same one the use for 45 Colt, but check my memory.
45 Auto Rim use same die set as 45 ACP with a different shell holder.
Cases from Starline for sure.
Simple and easy to load. Watch the loads for the Webley or risk damage to Webley and body. I recall Outpost75 posting loads. He is a great source for these (and other enjoyable interesting handguns).
Two really enjoyable rounds to punch holes in paper.
There was a firm said to plan on making the Webley automatic revolver again which would have me getting my money in place to buy one. Wonder what ever happened to the effort?