Was jug choking ever available for sub gauge barrels? If not, if popular in 12 gauge why not? (excepting the cutts which I have seen in all gauges).
Search ShotgunReport for “Tula”. That’s the Russian name for their jug choke. Quite a few gun companies (Baikal, Krieghoff, Perazzi and some others) have used jug chokes in 12 gauge. I just don’t know if any used them in subgauge. As you mention, the Cutts was in all gauges.
Shotgun Report’s Technoid