I wouldn't recommend it, but I know there are many who say it's ok so long as you have a Modified or more open choke. My catalogs give two choke options for the 311 in 20ga, 26" barrels with Imp. Cyl. and Mod., and 28" with Mod. & Full.
As for Non-steel, non-toxic shells take a look at Hevi-Shot's offerings. Their Classic Doubles and Hevi-Shot Duck loads will fit the bill, but they're a bit pricey. Rio Ammunition (out of Spain) has come out with some Bismuth loads as well. Kent also makes some Bismuth loads that are about 1/3 the price of the Hevi-Shot and you can get it from Cabela's. I would recommend emailing whichever you go with and asking which size shot to use with your particular chokes just to be on the safe side. I'm not a waterfowl hunter so I can't help you much there.
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