I just picked up a 32" Ithaca with F and F chokes. Now I have to figure out your question for myself. I don't need a gun choked that tightly but it is too nice to make into a shooter by altering the chokes. So I am going to try PC spreader post wads to see if I can get a more useful combinations of chokes. If I can just get a Mod and Full combination I would be extremely happy but even IM would help. It might be the perfect 30-50 yard Dove gun. Might get to try it out on late season birds in a few weeks.