A friend of mine moved to the country recently and he decided he needed a shotgun for "home defence" and snake medicine. He picked up a great deal on a Mossberg 590 SS. It was grity and dirty in the bore, but looked like it had only been shot a few times. (now to the question) He asked me what kind of shells I thought he should get for having around the house. I didn't really know what to tell him for home defence because I've heard many conflicting opinions on tpye of shot. I thought 00 Buck would be my choice, but another friend said that it might go through walls in the house and hit unintended targets. My final opinion was for him to get a few boxes of 7.5s and 4s and 00 Buck and shoot some to see what he likes.