I use IC and Mod, or IC and LM. Sometimes the full or IM does not pattern any tighter than a Mod at longer distances. They do on a pattern board at 20yds but not at 30 or 35 ( more shot deformation I think) Your gun might be different but don't assume what happens at 20 holds to 30 or 40.
I shoot quite a bit of sporting with a Remington 1100 Sporting .410 gauge. The most open choke I use is an improved cylinder (this is what I shoot skeet with). The choke I use the most is a Modified. From there I go to a Full for the long shots (35 yards and up).
I shoot 2-1/2 shells with 1/2 ounce of 8-1/2's and switch to 7-1/2's for the really long shots.
I was interested in the newer 1100 Sporting .410 because it's said to be set up to cycle both 2.5" and 3" shells, and it has choke tubes.<br>
But given the low recoil, the .410 870 Wingmaster would be a good alternative, except that it has a fixed mod choke. (The 870 .410 Express has a fixed full.) I wish Remington would have put screw in choke tubes in the 870.
I shot sporting clays at Ozark Shooting Sports in Missouri with two guys who were shooting 410 Browning O/U's. I was amazed the solid hits they were getting- as good as my 12 gauge on most shots. Makes me miss the 70's when we all shot skeet with 410's. They were a lot cheaper than 12 gauge shells back then.