Consider that capacities of tubes (a shotgun bore is a tube) are proportionate to the squares of their diameters.
"IF" you would be willing to touch off 22 grains of RedDot under 1 5/8oz shot or 19 grains under 2oz of shot in a 12 gauge, by all means have at it. Those are comparable loads to those .410 loads cited.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra