New Mk II 455 brass is currently being manufactured by Hornady. No need to rely upon the spotty import situation with Fiocchi ammunition, or really having to dig to find suitable berdan primers for old military brass. I've purchased some within the past month from Graf and Sons.
Now, if we could get someone to make Mk I brass...
My Grandpa used one of these when he was a cop. I love to get my hands on one of those. I like the way the empty brass jumps out when you "brake" the top open.
Would it be advisable to use standard pressure commercial .45acp loads (obviously no +P) in a converted Webley (MkV or MkVI of course)? I don't reload so it'd be nice to use Winchester White Box that I can get a Wal-Mart if I got a converted one.