I shoot 410's in a lot of things and I want to shoot them in this Handi too. I did some shooting the other day and everything wa OK except about half the time, the ejector would ride over the rim and I'd have to dig the case out with a pocket knife.
I tried 444 cases loaded with shot today and they all ejected fine. I use the 444's loaded with buckshot in my 45LC Derringer because I shoot hot loads and the 444's headspace a little tighter.
You could load 45/70 cases with shot and they did in the old days (Used wooden capsules) but that's a terrible waste of a 45 case.