Should be able to use a brake cylinder hone to make a jug choke, the hones with the tiny balls of abrasive - by a skilled operator, that is, who is able to 'feel' what he is doing.
They will collapse to get it into the bore the depth needed, mark the rod for the necessary length of desired 'jug' , turn on the power and relieve that portion. You will need to stop and test pattern - often. I altered the chokes on both barrels of my 10 bore, using this tool and method. I was after a goose killer and ended up with R-94% X L-96% on 30" circle at 40 yards. It was too murderous on a mallard - 180 pellets hits using 2oz. #5's.