I've had good results using the factory Winchester or Remngton 255 grain RNF swaged lead bullets. They are 0.456" diameter, intended for use in .45 Colt cartridges, but the diameters are suitable for .455 British. .45 ACP bullets typically are only 0.452". Otherwise you can cast your own or buy from custom cast bullet suppliers.
Fiocci makes loaded ammunition, as does a couple other European makers.
Finding boxer primed .455 British cases should be no problem. Try Hornady, Midway, Starline, and other cowboy action reloading sources.
I would advise NOT converting your revolver, but reload it in the original .455 British caliber.
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