In my Belgium copy of the Webley bulldog in .442 Webley, I found it easier to use .45 Spl (Cowboy) Brass. This is shortened .45 LC brass for cowboy action shooters. You have to trim it to length, but, in my gun, it's perfect for those huge bored thru cylinders. it's rather convoluted to make the shells though, crimping being the big issue. perhaps this will give some ideas.