I assuming the Federal Premium "solid base" is the Nosler Ballistic Tip bullet - since Nosler hasn't made the old Solid Base for about 10 years now. These tend to be a little soft for elk. Great deer bullet. Will work for elk on broad side rib shots,but will almost certainly blow up in the shoulder or run out of gas early on any sort of quartering shot.

Although the Fusion bullets are pretty new, preliminary reports suggest they will likely penetrate and hold together well.

Can you come up with any Nosler Partition or Nosler Accubond bullets in that weight? Both of these are proven elk bullets.