Every job a shotgun does has its own shell. Clay target loads by the flat, upland and waterfowl birdshot, defensive 00 buckshot and rifled slugs for deer zones - stocked across 12, 20 and 28 gauge plus .410 bore from Federal, Winchester, Remington and Fiocchi.
If the gun is for home defense, pattern it with the exact buckshot load you intend to keep loaded; point of impact shifts between brands more than most shooters expect. Shop by gauge below.