What I mean is you typically have 9 pellets of 00B in a 2.75" 12-ga load and 5 pellets of 000B in a 3" .410 load (okay, so not half the power, but you still lose a lot of pattern and lead going downrange).
I'm also not saying the .410 is bad, but if you're wanting HD power with less recoil, switching from the shotgun platform to a rifle is probably a better bet, because of how the rifle does its wounding.
I do advocate the use of .410 revolvers for SD, but .410 vs. .357 magnum is a big difference between .410 vs. .223 Remington. In my personal situation, I probably would go with a .410 over an AR, simply because I can use .410 at the range I go to and there aren't any rifle ranges nearby. I'm just saying it's something to consider.