Jug choking also gets used in muzzle-loading guns because it is easy (or possible) to load through a jugged choke. It may, or may not, have been developed before the muzzle-loading era declined. It's the same process described above. It's not unusual for people who shoot reproduction fowlers to have them jug choked. Because such guns are generally made with barrel-wall thickness that greatly exceeds that of the British doubles discussed on this board, they can sometimes be jugged to full choke for turkey hunting.
There was also a period where guns were converted to cartridge, and the cylinder bores could be jugged to achieve some choke on the converted barrels.
