Useful? You bet, ask most any farmer. .410s have probably been used to deal with more rodents, opossums, snakes and other pests around barns and livestock than any other shot gun. Low recoil, less noise than the others. They can be fine small game guns too, but you can't be as 'sloppy' with them as you can with larger gauges and need to aim and squeeze rather than point and slap. By the way a .410 delivers approximately the same energy as a .357 Magnum from a six inch handgun. And though I would not choose to do so it is legal in some states to hunt deer with .410 slugs and some folks do.