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Going by the logic it would be that the sinkers are too big for the ducks to eat as grit.

Nah for some reason I had it in my head that lead is fine for 410 but only junior shooters are meant to be using them as per Fish and Game. I was wrong though. But yea, I wouldn't be out there using...

Was gonna say "Fish and Game?" But turns out I'm wrong. I'm sure I read it early on in the piece when the 20ga rules changed over but either I'm mistaken or it was an early draft we saw.
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Also note that 410ga is only for junior shooters.

Didn't see it mentioned but just in case anyone doesn't know. You must shoot steel now over water in 20ga. Same as 12ga. So you might as well just use a 12ga if you have the option.