One of the reasons I greatly reduced my water fowl hunting was steel shot. I very strongly disagreed with the move and at the time I was on the board of directors for a organization that was instrumental in getting the lead shot ban enacted. The majority advocating the ban and making the decisions were none hunters and anti hunters. Steel does not effectively kill as well as lead at a given range, "period" and you can argue that back and forth until the cows come home but you will never convince me other wise, I tested it, played with it, experimented with it, and decided for steel to be effective you must change your hunting habits, reloading procedures and learn new shooting technics, and open your wallet more as it is going to cost you. It is also costing us more wildlife as my opinion as a lot more birds die from wounds from nontoxic shot than they died of lead poisoning. I don't have any statistics to support the statement the same as there are no statistics to refute it.
I am not old but old enough to have been brought up in the lead age, and old and experienced enough to know political self centred BS when I see it, and that is exactly what the lead shot ban is.
So to answer your questions, I only use steel shot if I absolutely have to. And then I cut the range down to 30yds.+or-. It's a whole new learning curve as the shot strings are short and moving at a higher velocity, so the sight pictures are different. Even with lead most ducks and geese were shot at to great a distance because the average hunter was a poor judge of it. So with nontoxic the ranges have to be cut down even further, this to me is one of the most important aspects.
I will not use nontoxic on upland birds or pheasants. Doesn't make one iota of sense to me not to use lead. The original ban on lead shot was because water fowl (trumpeter swans) were ingesting lead shot from heavily hunted areas while feeding and dying of lead poisoning. Upland areas do not receive the hunting pressure to build up the surface quantities of lead to result in lead poisoning. In fact nor do the vast majorities of water fowl areas in this country.
Do I feel comfortable pass shooting with nontoxic shot? "No" at least not personally, unless the birds are close 25yds. Hell I have shot geese at that range with lead #4's 1 1/4 oz @ 1330 and had them shutter, fly another 300yds and then fall out of the sky dead, that has happened on many occasions with different lead loads in our goose hunting group. I can only imagine what nontoxic results would have been.
With this thread I have just realized there is a whole generation of hunters that have not hunted water fowl with lead, so you really do not have any basis to draw on for a comparison. Lead as a projectile is highly effective and cheap. I am old enough I guess to be set in my ways, opinionated, grumpy and stubborn to change especially when it was not needed in the totality that was enacted.