If I wanted something like that I'd put a WTB ad in a blackpowder-specific forum. You could probably find a machinist in the same place who'd drill it out for you.
I got my 6" 1860 the same way. Said I wanted a used 1860 to cut down on a forum, had an offer within an hour and had the seller send it directly to the machinist I knew from the same forum.
Lots of the old trick shooters in the day ordered their guns both revolvers and rifles with smooth bore barrels from the manufacturers. Made you look like a great shot and didn't endanger your audience shooting fine angel dust shot in your guns.
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