I'm currently infatuated with 20ga guns. Although I can see why some would find the 28ga attractive, I just don't see a practical advantage in going down from 20ga. It seems to me that there are many times fewer 28ga vintage guns than 20ga and even the 20ga guns are much rarer than 12 or 16ga. I can buy cheap ammo for my 20ga modern load capable guns. I do have some .410's when a steep challenge is what I want, so I'm just not all that keen on the 28g for those reasons.