You are not concerned at running steel loads through your 28? Wouldn't a problem with 1 oz loads be the same sort of problem you might have with steel?
I can't say I would honestly consider using my lone 28 on ducks, I consider it more of a bluebird day grouse and woodcock gun. I have never considered the possibility of using steel, or, a 1 oz load in a 28, either.
As to 1 oz loads in a 28, if they are out there, it would suggest that someone is buying them. It isn't me.


Best,
Ted