Well I don't shoot competition and I don't take combat courses....I shoot because I like to shoot so having said that, I usually site my gun in around 15-20 yards...my reasoning is because these are the most common yardages I shoot from, these are close enough for me to get reasonable groups from a supported firing position, and lastly I shoot slightly farther than I would typically need in a self defense situation in the house so I have more confidence should the need arise. The reality is that I practice from 7-25 yards because that is what I like to do!
Man once surrendering his reason, has no remaining guard against absurdities the most monstrous, and like a ship without rudder, is the sport of every wind.
-Thomas Jefferson to James Smith, 1822.
We cannot solve our problems with the same thinking we used when we created them.