Larry, they will fit just do not over torque the rings. The 6.5 American Predator is more than capable of less than 1MOA accuracy with the right shooter and ammunition. You will be a 3rd of this combination, unless of course, you're Bob Lee Swagger.

they will fit on and tighten but not correctly as the Ruger has a Factory-installed, one-piece Picatinny scope base. As far as if it is a sub moa that would depend on if you get a good one and find ammo it likes