I use a MOD choke on my 1100 CM and never changed it ever. Shot a match with poppers at 50 yards using slugs and got them with just one shot each. I'm no expert and just started shooting 3-gun early last year, but due to my ignorance I never really knew when I should be using the IC and rifled chokes that came with the gun. The MOD choke seems to work for me as an all-around choke, but should I use the rifled choke when shooting rifled slugs? What's the general rule when to use IC and MOD chokes? Thank you all.