I Recently picked up my first wheel gun: a 1918 Webley Mk VI

The cylinder has been trimmed to fit moon clips allowing one to fire .45 ammo but I have yet to shoot it.

I just swagged the bore and it measures out at .447"

I have done a good amount of research on my own regarding reloading for it and was very surprised to find the bore so small, as I was expecting something larger as this pistol is supposed to shoot .455 caliber ammo, and most lead bullets for this unit are supposed to be about .453-.454.

The barrel does look original, so I cant really understand that his pistol is bored out to actually shoot .45 ammo.

Given this information, what bullet diameter should I be reloading with as now I'm quite confused.
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