I have one of the MK IV Webleys that was given to me by my brother. It's marked "War Finish" and it shows; it's pretty rough. The gun is definitely tight, though and doesn't show much use. The one brand of factory ammo I tried provided horrible accuracy and leaded the barrel. When I pulled a slug, it measured 0.355" so I suspect they went cheapo and used 9mm slugs.
I'm starting to handload for it now that I found a source of 0.361" bullets. I bought some of their 200 gr slugs, but they're a bit long for the cylinder. The originals were pretty stubby.
Anybody have a good source for 200 gr 0.361" bullets?