yeah, i've used rifled slugs in my 1100 tactical, which is full open. They worked fine. I've read that an improved cylinder is a good all-around choke and can be used for skeet or clays. That may be what I go with.
And, businessoptics: I think chokes keep the shot pattern tighter, not more spread apart. It helps you hit targets at longer distances than an open barrel would allow (though they do have a few that spread out the shot FASTER than an open barrel for home defense situations). You match the choke to the distance that you need.
I guess I knew the basics, but wanted to know if there was a real good place to start for sporting clays. I've seen several suggestions online, but most say to go with the improved cylinder to start with. I wanted to make sure these suggestions sounded accurate to you all.