The Cartridges of the World manual sez the .45 ACP is more robust than the .455 Webley. And there is the advantage of moon clip rapid reload.
To add to this list I nominate both the Colt and the Smith & Wesson models of 1917 in .45 ACP. Both are a huge chunk of gun, all blue steel exc for wood grips, the only two materials a real gun should be made of, JMHO.
Yes, my FIL had a S&W 1917 .45 revolver. They were more robust, but smaller in size than the Webley. I tried to get it when he died but his widow sold it to some guy without saying a word to the rest of the family. Damn, shame, it had real ivory grips(not factory standard)that had turned yellow with age and had been used by some sheriff in Arizona or one of the other western states before my father in law bought it.
And, as Patton would say...definitely not PEARL HANDLED!