At this point you have a very fine cylinder bore coach gun. I seriously doubt that choke tubes would add to the gun's usefulness. 16 gauge buckshot is limited to a narrow choice so experimentation is limited. Modern shotgun shell wads enclose the shot and this arrangement will make your cylinder chokes shoot a tad tighter. Also, larger shot sizes(6 compared to 8)will usually result in tighter patterns. I say this because you may wish to include the Ithaca on squirrel or rabbit hunts. For quail hunting you have a good companion too. For more information about any topic pertaining to patterns, loads, and suitable gunsmiths, you might consult this outfit. ballisticproducts.com