“I can’t get that link to work, but the Webley .455 “mankiller†round is a neat relic. Plan to do some reloading, because new .455 is about a buck-plus a round.”
Which link are you referring to?
The Gun Watch link worked, last I tried it.
Because of the lack of .455 ammo you can machine down the rear of the cylinder and ream the chambers to use .45ACP in a half moon clip, or auto rim ammo or .45 Long Colt for the Colt and S&W revolvers I believe the British pistols have too short a cylinder for .45 Long Colt but can be converted to .45ACP and auto rim.
I believe Auto Rim is no longer made, but I saw lots of new brass at my last gun show.