A lot of waterfowl hunters in my area and a lot of them have the 12 gauge 3 1/2 inch guns and swear by them, with steel shot.Many hunters will pay big bucks for a gun,but bulk at paying even a dollar or two more for a box of shells.Go figure,but it is the truth.They want the cheapest ammunition you can get for the most part ,and steel non tox is at present the cheapest you can buy.
There are 12 ,20 and 410 3 inch shells available,I see no reason why all the fuss about not having the 28 gauge available in 3 inch.If you do not use them now,it is quite possible as things change in the lead use in the field world,it may come to the need for it, with steel shot.Some say just buy more expensive shot or use a different gauge.True that could be done,but there are those of us who like to use the 28 gauge in the field and want to continue to do so in the future.Plus there are many who are just too cheap to buy the very expensive non tox other than steel.
Just because you have had gun chambered for 3 inch 28 gauge shells ,does not mean you have to use 3 inch shells if you do not want to,but you have the option to do so if you want to or need to in the future.