Part of this is a couple of instances around the planet of super high lead levels caused by a lot of lead shot remaining on the ground and getting into the food chain. Any lead shot is considered bad and to be ended by any means - and the .410 is probably to small a population of shooters to be considered as enough to put up a fight. Death by a thousand cuts again, but this time not the anti-gunners...
The comment about steel rusting is correct, I've worked in silty bottom conditions where there is a lot of steel debris and not much grows - too much iron makes the bottom conditions acid and turns it into a disgusting orange sloppy goop. Not nice to work in, that's for sure.
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