Shooting at long range with a pistol can be fun, but don't think it is self defense training. 86% of police involved shootings take place at 7 yards, 50% at 5 feet.
If you feel you have mastered this, then go have fun shooting long range.
The issue with long range shooting is "Is it a threat?" If the shooter has a long gun, yes, it is, or could be. If he is shooting but missing by a great margin, take cover and call 9-1-1.
And remember, if you advance toward the shooter (as implied here), YOU may be seen as the agressor. At the least you will have a harder case to prove in court.