Dreaming of shooting guns either in the open or at the gun ranges represent male vigor and virility. Upon hitting your targets, your own demonstration of manhood is for all to witness.
Also, on the other hand, gun shootings in dreams signify that danger is creeping around the corner. When situations get out of line, and you tend to stroke the fire by being violent or acting brash. Stop for a moment to think how the volatile situation could be handled better without heighten angers.