+1 on the S&W Governor, 6 rounds to the Taurus's 5, .45ACP with moon clips for cheaper shooting and faster reloads (a full moon clip is the fastest way to load a revolver, and it holds all your brass for ya nicely when you eject it, plus they're easier and more compact to carry than speedloaders). If you like carrying mixed loads the governor is great, say a rd of snakeshot, a round of buckshot, 2 rounds of .45 JHP in a 1/3 moon clip, and 2 rounds of full house .45LC, if you haven't stopped it by the sixth pull you should have brought a rifle...
That said I'd rather carry a .357 (or maybe .45ACP) revolver if I was going to carry one and I do sometimes, lighter (even all steel), more compact, easy to carry and load, you can already do so much with different loads and bullet types that I don't see the point of shotshells. Can go from .38 snakeshot and wadcutters up to magnum loads that will be more effective stoppers than a .410 in any barrel, .357/38 are cheaper and they're easier to reload anyhow.
Also with those .410 revolvers don't be silly and load it with .410 slugs... what's an undersized 98 grain projectile bouncing around your barrel leaving lead behind versus a 255 grain .45 colt going just as fast that you could have loaded instead?