If your rifle shoots nice .5" groups at 100 that is not far different than your 1.5" groups at 200. It sounds as if the rifle is doing it's part well enough. No offense intended, but perhaps it is time to put the Lead Sled away and focus on technique. 200 yards is still fairly close range so shooting the different methods (Satterlee, OCW, ladder, etc.) will probably not provide you with really useful answers.