[myfriendis410]

My experience with factory chokes is that they are (usually) a suggestion more than reality. To determine what a particular choke will do with a particular load you have to actually pattern the gun. IC is choked down below cylinder--about .006" in my 391 and in that gun is a good choice for overall bird hunting. A full choke would be used to get the tightest pattern in a lead load but would be inappropriate for use in steel shot loads for duck and geese. A modified choke is about all I would use for that.

My advice would be to get a rifled barrel and find a sabot that shoots the best in that barrel. A good barrel/sabot combination will easily give you 100 yard one shot kills on deer. You also have the advantage of having actual sights to use rather than a bead, or with a cantilever scope mount barrel to actually have optics on it.