Luckily I know a few people around the world who are similarly affected by the vintage rifle bug and only an email away is a guy who's owned a 20 gauge straight rifled Rolling Block.
So I got a heads up on what I might expect
Turns out that's what I've got
The left bore is 1:60" 8 groove twist rifled with a .662" groove and 46mm long chamber
The right bore is 12 groove straight rifled with .660" groove and 75mm chamber
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