I don't know if you can get it jug choked or not, but in talking with Lloyd Tennyson about this a year or so ago, I remember his telling me that the only way would be to seperate the barrels,do the choking then re-connect and re-regulate the barrels again.
I have a double 20ga made by David Dodds that is a duplicate of an original 1810 New York piece. I had the left barrel full turkey choked and the right barrel modified choked. At the time Dave strongly urged me to reverse the choke system and have the turkey choke on the right side FOR THE REASON REBEL POINTS OUT! I didn't,and I regreted it.
Recently had Ed Rayle build a set of 16ga barrels for wing shooting. The left barrel is cyl bore,and the right barrel is choked ten thousandths. :winking: