If you want a "big gun", consider a larger bore S&W or Ruger in something like 44 mag or a Glock 10mm. But you don't have a 22, which is why I suggested you consider a 22 rifle. I think you have the home defense front covered with what you have already. You mentioned that you can't hit much with the Taurus 38spl revolver..... not so sure going bigger is going to help you, but that is just my thought.