If I ever won lotto, discovered oil, diamonds or coal on my land, had a long list relative leave me immense riches, and I ordered a bespoke new .416 no.2 Rigby from Rigby I would be tempted to have it regulated for ...

the Woodleigh 450 gr .416 bullet in SP Weldcore and FMJ.

Rather than the usual 400 gr.

I think the .416 with 450 gr could be as effective, maybe penetrate better than a .458 480 gr projectile.

If the 75% rule played true, a 300 or 350 gr SP, if it regulated well, would make it a very versatile rifle.

Yes I would provide for a scope. And I assume regulate it for the scope. Hopefully would scope to reasonable regulation at close ranges without it. (?)

But a key question, if covering it with large font gold lettering, is there enough barrel surface, top, side and bottom, to fit all the bullet weights?!