Long range shots have a place in some areas such as the wide open areas of the middle east.
In a less open area? It most likely would not be the best way to handle approaching forces.
Drop one target and the rest go under cover and become very cautious in the approach.
Better to allow them to approach and catch them at under 400 meters where your more apt to take multipule targets down before they can react.
This is of course based on what I think would happen in my area in a survival situation.