If it groups well at one range, then the group size should be linear increasing in size as you go further out. That is, a one inch group at 100 metres should be around 2 inches at 200 metres, all else being equal (including sighting equipment).
But, you are not very clear about how well Super X shoots, and at what range, and what you mean by all over the place further out.
As I mentioned before, Federal makes a couple of types with premium bullets. As per their website, consider the 150 grain Nosler Ballistic Tip, or the 180 grain Nosler Accubond.
What kind of expectations do you have, and how far out do you want to shoot?



























