Rufus had a shotgun? I though it was more of a whacked-out pistol. If it was a shotgun how the heck did he miss Kadaj?
I don't think he was aiming for Kadaj, I think he was aiming for the box with Jenovas head.

On topic, the masamune happens to be my favorite FF weapon of all time, but Kadaj's Souba is a close second.