The jug choke I do measure ,,,Imp 8-10,,,,Mod 16-18,,,full 24-25. I have never tried more than 25 as it produces excellent patterns. It would take quite a while to hone that much out. The trick jug choking is that the jug needs to have slow taper going into the jug and a faster taper into the choke. Not saying it couldn't be done, you would just have to be very cautious, get plenty of extra stones, honing oil and pull the hone and check jug often, Do you have an instrument to check to jug as you hone? ...Ed