00 weighs about 58 gr/pellet. 8 of them in a 12g shell is about 460 gr. 58 gr isn't going to penetrate too many walls but it'll sure as heck penetrate a bad guy at 15' plus it'll spread enough to make hitting him a lot easier. That's very important when you're sweating blood. 99% of us have never been in that situation, me included, and we never know for sure how we'll react. Most of us won't be at our high point when it comes to accuracy.
Shot doesn't spread much at room distances, and buckshot penetrates drywall like tissue paper.
