I went to the range yesterday and shot 3 five shot groups at 200 yds. the shots measured less than .5 inches left to right but 6 freaking inches top to bottom, any ideas? BTW it is a Savage bull barrel .223 topped with a Simmons 6.5-20x44. Has a history of shooting under .5 inches @200. Harris bipod in front and sandbags in the rear. Black hills match hollow point (68-69 grains).