Every shot reinforces the skill levels used in making that shot. If you used perfect technique, you reinforced that perfect skill level which will help you next time. If you are just putting rounds down range, you are actually reinforcing careless skill levels which can lower your skills. EVERY shot in practice shoud be as perfect as you can make it. When you can't exert that level of concentration, QUIT shooting to avoid lowering your skills.
Good shooting and be safe.