I’ve used both magnum and non magnum small rifle primers, mostly CCI 400 & 450, in Casull loads with similar results from both. Winchester small rifle primers will do also. What you need to watch for is possible primer flow in the higher end loads with the Federal primers, or ignition problems if hunting in below 0* temps.
If you run 300 grain bullets with around 17.0 grains of HS-6, you should have no problem with the Federal primers. The Ruger isn’t going to stand up to Freedom Arms dinosaur killer loads anyway, unless Ruger has made significant changes since I sold mine.
Ultimately, it’s going to boil down to whatever combination your revolver likes.