Im new to the AR platform and want to set some goals for my practice time. When shooting a AR type weapon at in indoor range (with a max distance of 75 feet using iron sights from a standing position) what size groups should I reasonably strive to shoot? And what drills would help to safely improve accuracy? The range has a variety of classes that I can take, in the meantime any suggestions from y'all? My goal here is to achieve some decent close quarter skills and then move to the outside range in warmer weather.