For handloading in a .455 Webley ("shaved" or not) the Remington 250gr LRN would seem like a good bullet to use. This is fairly close to the original weight so it should shoot reasonably close to the sights, it's a .455 diameter which is correct for .455 Webley Mk. II ammunition, and it also has a concave base that will likely obturate to the bore.
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