I don't know my arse from my breech, but I do know that quite a few guys with flintlock fowlers do get them jug-choked, usually specifically for turkey.

As I intimated, I don't know the procedure but I think Joe is on to it. I'll bet he's known some guys who've had it done.

The muzzleloading site I'm a member of could supply me with a smith or two who perform this service if someone here needs to pursue it.

I'll tell you one thing; the purists are strictly against the practice because, of course, nobody had such a barrel back in the 18th century. But there certainly are some guys today who have no qualm about that.