A modified choke works best with a .410 for skeet and sporting. Because of pellet count your useable pattern is only 17-18 inches in dia. A more open choke will give a wider pattern but at the cost of density. I had a Browning 3 bbl. skeet set and it was choked mod/mod or .400 dia in both barrels from the factory. I had choke tubes put in a Brng Model 42 reproduction, I ended up puting the mod. tube in and never change it. Remember .410 chokes are, .410= cyl, .405= IC, .400= Mod., .395=full an accross the board spread of only .015". You do find an odd ball now and then though. I bought a Charles Daly .410 O/U (Italy) that was marked F/F, but actually measured .375 / .376 .020 over full. I broke out the choke reamers and made it .400 / .400 before I ever shot it, shoots great now.