I have not used those particular brands, but I can tell you that mine (Remington 870) with rifled barrel is as accurate as advertised WITH SABOTS. Dont make the mistake some do and shoot pumkin balls or rifled slugs and expect to get great accuracy (its also bad for a rifled barrel). I shoot Winchester 1 oz. sabots and easily get 3-inch groups at 100 yards with open sights and no bench rest. With a scope and bench I have no doubt tight groups would be easy. What you basically have is a 50 cal. rifle and it is DEVASTATING on deer.