To the OP & in the FWIW Dept. I've had good results on dove using the 3" Fiocchi ammunition loaded w/ 11/16oz. #7.5 shot in a model 42 w/full choke.
Stan's previously noted distance limitations are accurate in my experience as well. Flukes happen, but you can't take them to the bank.
I'd say to use what points best for you; dove can be fleeting targets and use the above ammo if you are using a 3" chambered gun or the newer 2.5" WWAA sporty clays rounds in #8.5 for best results. I'm not a fan of the smaller shot sizes for bagging dove, but that particular ammo has printed some very nice patterns on the grease plate for me & produced some impressive scores in sporty clays competitions for others. Dove are not hard to kill, but they can be difficult to hit.
