I go a different direction. I use .45colt cases to load .410 shells.
Mostly grits or walnut hull to shoot carpenter bees. I've loaded a few with shot, even once with #6's and killed a squirrel with it.
Btw, a .45colt case with 5gr Bullseye, card wads cut with 7/16" punch, will hold 0.4oz lead shot.
From the .410 o/u, its like shooting .38spl in a .357mag.
The .45 shot load will be much superior to the cut down .410 from a .45 revolver. The shot shell primer and hull construction is too bulky yeilding much less internal capacity.
I've tried using gas checks; works great! But increases cost by 6X!
Wads cut with 7/16" punch cost NOTHING.
I finally figured out how to reduce the base of some range pickup .45Casull brass to where it will chamber and extract. They hold a full 1/2oz shot. They're all loaded now with walnut hull media for the bees.