Can anyone think of a REALLY good reason that you'd just have to have a 3" chamber on a tactical shotgun for self defense purposes? I'm doing some looking and I can get a really sweet deal on a barrel that is only chambered for 2 3/4" shells and I'm thinking why would you ever want to load 3" shells for defense anyway? They have greater recoil, and more penetration. Is my thinking right? Thanks.