Problem you're gonna find loading for that is it really shoots best with lead bullets - .45 Colt bullets are a little undersized, but work well enough without getting into really expensive casting setups. Load a 250 grain bullet to about 600 FPS and you're within the ballpark of what the .455 should be doing.
When these were first converted in the 50s and 60s guys shot USGI surplus in them all the time, but it's still a proposition I can't really recommend. I've got a Mk.VI that's still in .455 and it's a joy to shoot.
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