I use almost the same setup as you. I loaded 25grs of IMR 4895 powder with CCI small rifle primers and a winchester 55gr Boat tail round. I am satisfied with my results I can get bullet on top of bullet at a 100yds and the groups very to about .50 inches. I have an Oly Ar15 with an Aimpoint ML3 red dot sight. I am not sure how much better you can be using magnum primers but I know they are pricey. I just shoot for target. The groups I had using Federal XM193 varied from 1 inch or even more.
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